Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 20 de 2.227
Filter
1.
Braz. j. biol ; 83: e246385, 2023. tab, graf
Article in English | LILACS, VETINDEX | ID: biblio-1339384

ABSTRACT

Abstract Coronary heart disease (CHD) has been associated with significant morbidity and mortality worldwide. Although remain controversial, several studies have demonstrated the association of M. pneumoniae infections with atherosclerosis. We evaluated the possible association of mycoplasma infections in patients diagnosed with atherosclerosis by ELISA and PCR methods. Atherosclerotic tissue samples and blood samples were collected for the detection of mycoplasma antibodies (IgA) by ELISA from the 97 patients with coronary artery disease (CAD). M. pneumoniae specific IgA, IgG and IgM were measured by using the Anti-M. pneumoniae IgA/IgG/IgM ELISA. Detection of M. pneumoniae targeting the P1 adhesion gene was performed by PCR Acute infection of M. pneumoniae was diagnosed in 43.3% (42) of patients by PCR. The M. pneumoniae specific antibodies were detected in 36.1% (35) of patients. Twenty-five (25.8%) cases had IgG antibodies, 15 (15.5%) cases had IgM antibodies, 3 (3.1%) cases had IgA antibodies, 10 (10.3%) cases had both IgM + IgG antibodies and 1 (1%) case of each had IgM + IgA and IgG + IgA antibodies. None of the cases was positive for all three antibodies. A Pearson correlation coefficient analysis revealed an excellent correlation between the PCR and the serological results (r=0.921, p<0.001). A majority (17, 40.5%) of the M. pneumoniae positive patients are within the 41-50 years of age group, followed by 10 (23.8%) patients in the age group of 61-70 years and 2 (4.8%) patients were >70 years of age. Our study reported an unusually higher prevalence of M. pneumoniae by serological tests (36.1%) and PCR (43.3%). Although the hypothesis of the association of M. pneumoniae and CAD is yet to be proven, the unusually high prevalence of M. pneumoniae in CAD patients indicates an association, if not, in the development of atherosclerosis.


Resumo A doença coronariana (DCC) tem sido associada a significativa morbidade e mortalidade em todo o mundo. Embora ainda sejam controversos, vários estudos têm demonstrado a associação de infecções por M. pneumoniae com aterosclerose. Avaliamos a possível associação de infecções por micoplasma em pacientes com diagnóstico de aterosclerose pelos métodos ELISA e PCR. Amostras de tecido aterosclerótico e amostras de sangue foram coletadas para a detecção de anticorpos contra micoplasma (IgA) por ELISA de 97 pacientes com doença arterial coronariana (DAC). IgA, IgG e IgM específicos para M. pneumoniae foram medidos usando o Anti-M. pneumoniae IgA / IgG / IgM ELISA. A detecção de M. pneumoniae visando o gene de adesão P1 foi realizada por PCR. A infecção aguda por M. pneumoniae foi diagnosticada em 43,3% (42) dos pacientes pela PCR. Os anticorpos específicos para M. pneumoniae foram detectados em 36,1% (35) dos pacientes. Vinte e cinco (25,8%) casos tinham anticorpos IgG, 15 (15,5%) casos tinham anticorpos IgM, 3 (3,1%) casos tinham anticorpos IgA, 10 (10,3%) casos tinham anticorpos IgM + IgG e 1 (1%) caso de cada um tinha anticorpos IgM + IgA e IgG + IgA. Nenhum dos casos foi positivo para os três anticorpos. A análise do coeficiente de correlação de Pearson revelou uma excelente correlação entre o PCR e os resultados sorológicos (r = 0,921, p < 0,001). A maioria (17, 40,5%) dos pacientes positivos para M. pneumoniae está na faixa etária de 41-50 anos, seguida por 10 (23,8%) pacientes na faixa etária de 61-70 anos e 2 (4,8%) pacientes tinham > 70 anos de idade. Nosso estudo relatou uma prevalência incomumente maior de M. pneumoniae por testes sorológicos (36,1%) e PCR (43,3%). Embora a hipótese da associação de M. pneumoniae e DAC ainda não tenha sido comprovada, a prevalência incomumente alta de M. pneumoniae em pacientes com DAC indica uma associação, se não, no desenvolvimento de aterosclerose.


Subject(s)
Humans , Adult , Middle Aged , Aged , Coronary Artery Disease/epidemiology , Mycoplasma Infections/diagnosis , Mycoplasma Infections/epidemiology , Immunoglobulin M , Prevalence , Antibodies, Bacterial , Mycoplasma pneumoniae
2.
Rev. otorrinolaringol. cir. cabeza cuello ; 82(3): 303-310, sept. 2022. ilus, tab
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1409938

ABSTRACT

Resumen Introducción: El personal de otorrinolaringología presenta una elevada exposición al virus SARS-CoV-2, debido a los procedimientos que lleva a cabo. Es fundamental tomar las medidas de protección adecuadas. Determinar la seroprevalencia nos dará un mejor panorama sobre la exposición, contagios y efectividad de medidas de protección adoptadas. Objetivo: Determinar la prevalencia de resultados serológicos positivos en personal médico que presta servicio en la Cátedra de Otorrinolaringología de marzo del 2020 a marzo de 2021. Material y Método: Estudio observacional, descriptivo, corte transversal, retrospectivo con asociación cruzada. Muestreo no probabilístico de casos consecutivos. La población total fue de 38 médicos del Servicio de Otorrinolaringología del Hospital de Clínicas. Resultados: La media de edades fue 37,4 años, 63,5% refirió haber atendido a paciente conocido portador de COVID-19. Un 42% refirió no haber cumplido con todas las medidas de protección personal, mientras que un 23,7% de los sujetos de estudio dio positivo para IgG, interpretándose como infección previa por COVID-19. Conclusión: Más de las dos terceras partes de los médicos refirió dar consulta a paciente COVID-19 positivo. Casi la cuarta parte de los médicos resultó ser positivo para COVID-19 según la prueba de serología anti-N. No se halló asociación entre consulta ni cirugía a pacientes portadores de COVID-19 y el contagio al personal médico.


Abstract Introduction: Otolaryngology personnel have a high exposure to SARS-CoV-2 virus due to the procedures they perform. It is essential to take appropriate protective measures. Determining seroprevalence will give us a better picture of exposure, contagion and effectiveness of protective measures adopted. Aim: To determine the prevalence of positive serological results in medical staff serving in the otolaryngology department from March 2020 to March 2021. Material and Method: Observational, descriptive, cross-sectional, retrospective, retrospective study with cross-association. Non-probability sampling of consecutive cases. The total population was 38 physicians of the Otolaryngology Service of the Hospital de Clinicas. Results: The mean age was 37.4. 63.5% reported having seen a patient known to be a COVID-19 carrier, while 42% reported not having complied with all personal protection measures. A 23.68% of the study subjects tested positive for IgG, interpreting previous COVID-19 infection. Conclusion: More than two-thirds of the physicians referred to giving consultation to COVID-19 positive patients. Almost a quarter of the physicians were positive for COVID-19 according to the Anti-N serology test. No association was found between consultation or surgery of patients with COVID-19 and infection of medical personnel.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Immunoglobulin G/analysis , Immunoglobulin M/analysis , Seroepidemiologic Studies , Health Personnel/statistics & numerical data , Otolaryngologists/statistics & numerical data , COVID-19/immunology , Paraguay/epidemiology , Security Measures , Prevalence , Retrospective Studies , Personal Protection , COVID-19 Serological Testing , SARS-CoV-2/immunology
3.
Article in Spanish | LILACS-Express | LILACS, CUMED | ID: biblio-1408441

ABSTRACT

Introducción: La circulación de células tumorales en la sangre periférica, conocido como carcinocitemia, es un fenómeno raro y muy poco comunicado en la literatura científica y su diagnóstico diferencial puede constituir un desafío en la práctica clínica. Objetivos: Describir las causas más frecuentes de carcinocitemia, los retos diagnósticos que representa y contribuir a elevar el índice de sospecha de esta entidad. Presentación del caso: Paciente femenina de 71 años de edad que acude por dolores óseos y palidez cutánea. En el examen de sangre periférica se observa células de gran tamaño que recordaron células plasmáticas. El inmunofenotipo por citometría de flujo fue sugestivo de mieloma múltiple isotipo IgM. El ultrasonido de mamas y la tomografía de tórax mostraron lesión tumoral en la mama izquierda. El estudio inmunohistoquímico de la biopsia de médula ósea fue compatible con adenocarcinoma de mamas. La paciente falleció sin haber comenzado tratamiento específico. Conclusiones: Se presenta paciente con células circulantes tumorales secundaria a adenocarcinoma de la mama donde la inmunohistoquímica de la biopsia de médula ósea descartó el diagnóstico de mieloma múltiple sospechado clínica, radiológicamente, por la morfología celular y el inmunofenotipo(AU)


Introduction: The circulating tumor cells in peripheral blood, known as carcinocythemia is a rare and poorly documented phenomenon, that can be a challenge diagnosis. Objectives: To describe the most frequents causes of carcinocythemia, the diagnosis challenges that it represents and to contribute raising awareness of this entity. Case presentation: Female patient, 71-year-old who complained bone pain and skin pale. The peripheral blood smear showed big size cells mimicking plasma cells. The immunophenotype by flow cytometry suggested IgM isotype multiple myeloma. Breast ultrasound and thorax tomography showed a tumor in the left breast. The bone marrow biopsy immunohistochemical was compatible with adenocarcinoma of breast. The patient died short after before receive specific treatment. Conclusions: We present a patient with circulating tumor cells secondary to breast adenocarcinoma where the bone marrow biopsy immunohistochemical ruled out multiple myeloma diagnosis suspected by clinical, image studies, cell morphology and immunophenotype(AU)


Subject(s)
Humans , Female , Aged , Bone Marrow , Immunoglobulin M , Adenocarcinoma , Multiple Myeloma , Neoplastic Cells, Circulating , Diagnosis, Differential , Flow Cytometry
4.
Chinese Journal of Pediatrics ; (12): 329-333, 2022.
Article in Chinese | WPRIM | ID: wpr-935696

ABSTRACT

Objective: To summarize changes of serum immunoglobulin levels before and after chemotherapy in children with Burkitt lymphoma (BL), so as to investigate the effects of chemotherapy and rituximab on serum immunoglobulin levels in children with BL. Methods: Clinical data of 223 children with newly diagnosed Burkitt lymphoma at Beijing Children's Hospital from January 2009 to April 2017 were analyzed retrospectively. They were treated according to the modified LMB 89 regimen and some of them received combined rituximab therapy during the chemotherapy. The serum immunoglobulin (IgA, IgM, IgG) before chemotherapy, at the time of discontinuing chemotherapy, as well as 6, 12, 24, 36 months after chemotherapy were collected. Changes of serum IgA, IgM and IgG with time among different treatment groups were compared using repeated measures ANOVA. Results: According to risk group, 223 children were devided into group B(n=53)and group C(n=170). Before chemotherapy, 109 cases (48.9%) were combined with hypogammaglobulinemia. The serum IgA, IgM, and IgG levels of all the patients were (0.9±0.7), 1.2 (0.5, 1.3) and (7.2±2.9) g/L before chemotherapy, (0.5±0.4), 0.2 (0.1, 0.3) and (6.3±2.3) g/L at the time of discontinuing chemotherapy (t=13.63, Z=-11.99, t=4.57, all P<0.05). There were statistical difference in IgA, IgM levels of group B and IgA, IgM, IgG levels of group C before chemotherapy and at the time of discontinuing chemotherapy (t=8.86, Z=-6.28, t=11.19, Z=-10.15, t=4.50, all P<0.05). The differences of serum IgA and IgG levels at the time after chemotherapy among patients treated with chemotherapy alone and those treated with chemotherapy combined rituximab in group B and C were significant (F=5.38, P=0.002 and F=4.22, P=0.007). Conclusions: Approximately half of children with BL have already existed hypogammaglobulinemia at initial diagnosis prior to the start of treatment. The modified LMB 89 regimen have significant effect on humoral immunity of children with BL. In the process of immune reconstruction after chemotherapy, rituximab has more significant effect on serum IgA and IgG levels in BL patients.


Subject(s)
Agammaglobulinemia , Burkitt Lymphoma/drug therapy , Child , Humans , Immunoglobulin A/blood , Immunoglobulin G/blood , Immunoglobulin M/blood , Retrospective Studies , Rituximab/therapeutic use
5.
S. Afr. j. infect. dis. (Online) ; 37(1)2022. figures, tables
Article in English | AIM | ID: biblio-1396131

ABSTRACT

Background: Different diagnostic tools could improve early detection of coronavirus disease 2019 (COVID-19). A number of antibody-based serological point-of-care tests have been developed to supplement real-time reverse transcriptase polymerase chain reaction (RT-PCR)-based diagnosis. This study describes the validity of an antibody test, namely the immunoglobulin G (IgG)/immunoglobulin M (IgM) Rapid Test Cassette® (BNCP ­ 402 and BNCP402), manufactured by Spring Healthcare Services. Methods: A prospective cohort validation study was undertaken at Chris Hani Baragwanath Academic Hospital between 16 July 2020 and 12 August 2020. A total of 101 patients admitte as COVID-19 cases under investigation were included in the study. They were divided into two categories depending on time since symptom onset: testing performed within seven days (early cohort) and after seven days (late cohort). The rapid antibody test was compared to the RT-PCR. Results: Overall, the test has a sensitivity and specificity of 85.2% and 80.0%, respectively, for a combination of IgG and IgM. Sensitivity and specificity of IgG testing alone were 81.5% and 85%. Sensitivity improved for testing with increasing time from symptom onset; however, specifity was not significantly different. Conclusion: The study data adds to the body of evidence that because of relatively low sensitivity and specificity, there is a limited role for antibody-based point-of-care testing in the acute phase of COVID-19 infection, as was the case with this IgG/IgM Rapid Test Cassette (BNCP ­ 402 and BNCP402). There may exist a role for such testing in patients recovered from prior COVID-19 infection or in seroprevalence studies; however, additional evaluations at later timepoints from symptom onset are required.


Subject(s)
Immunoglobulin M , Sensitivity and Specificity , Early Diagnosis , COVID-19 Serological Testing , COVID-19
6.
Sudan j. med. sci ; 17(3): 387-397, 2022. tales, figures
Article in English | AIM | ID: biblio-1398379

ABSTRACT

Background: Hepatitis E virus (HEV) is a hepatotropic pathogen that causes significant morbidity and mortality in humans. It is an important causative agent of viral hepatitis outbreaks. This study investigates the serological and molecular prevalence of HEV in blood donors attending the Central Blood Bank in Wad Medani City in Gezira State, Sudan. Methods: The study adopted a cross-sectional descriptive design. A structured questionnaire was used to collect data concerning demographic information and risk factors associated with HEV transmission. All enrolled participants (N = 300) were screened for HEV IgG antibodies using commercial ELISA kits, then strong positive samples (N = 84) were selected and rescreened for HEV IgM and HEV RNA by RT PCR. SPSS version 24.0 was used for analysis. Results: Out of 300 male participants, 36.3% (109/300) were positive for HEV IgG. However, only one participant was IgM positive, while the HEV RNA was negative. The highest prevalence rates of the virus were 42 (44.6%) among the age group of 31­40 years, 20 (48.8%) in those who consumed food from outside, 13 (50%) in three to four multiple blood donations, and 5 (62.5%) in those who consumed water from the river source. A significant association of HEV IgG prevalence concerning the occupation of the participants being students or farmers was detected using univariate and multivariate analysis (P-value = 0.007).


Subject(s)
Blood , Blood Donors , Immunoglobulin M , Polymerase Chain Reaction , Risk Factors
7.
Einstein (Säo Paulo) ; 20: eAO6237, 2022. tab, graf
Article in English | LILACS | ID: biblio-1364803

ABSTRACT

ABSTRACT Objective To describe the profile of professionals assisting homeless and socially vulnerable populations tested for COVID-19, and to determine potential associations with exposure at the workplace, on the way to work, or at home, among infected professionals. To describe disease symptoms and progression and to investigate potential associations with age, sex and exposure at the workplace, on the way to work, or at home. Methods A retrospective analysis of data of 173 workers employed by Serviço Franciscano de Solidariedade tested for SARS-CoV-2. Between May 20 and June 2, 2020, professionals and volunteers were tested for anti-SARS-CoV-2 IgG and IgM antibodies, by means of qualitative rapid chromatographic immunoassay in whole blood. A questionnaire was used to collect data on demographic characteristics and working conditions, history and date of onset of symptoms and risk factors. Quantitative variables were expressed as mean and standard deviation, or median, maximum, and minimum values. Data normality was investigated using the Kolmogorov-Smirnov test. Results A total of 46 (26.6%) participants had positive serologic tests. Of participants with negative serologic test results, 109 (85.8%) were asymptomatic. History of symptoms was the most significant independent factor associated with positive serology. Serologic test results and symptoms differed significantly according to housing (p=0.045) and working (p<0.001) conditions. More than half of participants (52.4%) living in shared households tested positive, compared to 23% of participants living in family households. Participants working remotely from home did not test positive. In seropositive participants, onset of symptoms was associated with workplace exposure and shared housing conditions. Conclusion History of symptoms was associated with positive serology for COVID-19. Shared housing conditions tended to be associated with higher risk of infection. Onset of symptoms was associated with higher levels of workplace exposure and shared housing conditions in seropositive participants.


Subject(s)
Humans , Homeless Persons , COVID-19 , Immunoglobulin M , Retrospective Studies , SARS-CoV-2
8.
Article in Chinese | WPRIM | ID: wpr-936145

ABSTRACT

OBJECTIVE@#To investigate the consistency of cytomegalovirus deoxyribo nucleic acid (CMV-DNA) and immunoglobulin M (IgM) antibody detections in patients with different clinical characteristics and their guiding value for clinical practice.@*METHODS@#From December 2014 to November 2019, a total of 507 patients who were detected with both CMV-IgM and CMV-DNA were collected in Peking University International Hospital. Their general information, such as gender, age and clinical data, including the patient's diagnosis, medication, and outcome were also collected. The groups were stratified according to whether CMV-DNA was negative or positive, CMV-IgM was negative or positive, age, gender, and whether they received immunosuppressive therapy or not. The Pearson Chi-square test or Fisher's exact test was used for comparison of the rates between the groups. P < 0.05 means the difference is statisti-cally significant.@*RESULTS@#Of the 507 patients submitted for examination, 55 (10.85%) were positive for CMV-DNA, 74 (14.60%) were positive for CMV-IgM, and 20 (3.94%) were positive for both CMV-DNA and CMV-IgM. Of the 55 patients with CMV-DNA positive, 37 were male, accounting for 67.27%. In addition, 25 patients were older than 60 years, accounting for 45.45% and 33 patients received immunosuppressive therapy, accounting for 60%. The rates were higher than that of CMV-DNA negative group, 47.35% (P=0.005), 68.14% (P=0.043), 46.02% (P=0.050), respectively. Of the patients with both CMV-DNA and IgM positive, 45% received immunosuppressive threapy, which was lower than that of CMV-DNA positive but IgM negative patients (68.57%, P=0.086), and also lower than CMV-DNA negative but IgM positive patients (68.52%, P=0.064). In the patients with both CMV-DNA and IgM positive, 91.67% showed remission after receiving ganciclovir, whereas in the patients with CMV-DNA positive but IgM negative, the rate was only 60% (P=0.067).@*CONCLUSION@#CMV-IgM antibody detection is affected by age, gender, and immune status. It is not recommended to use CMV-IgM alone to determine CMV infection in patients with immunosuppressive status and those older than 60 years. CMV-DNA and CMV-IgM combined detection may help to predict patients' immune status and outcomes of antiviral therapy.


Subject(s)
Antibodies, Viral , Cytomegalovirus/genetics , Cytomegalovirus Infections/drug therapy , DNA , Female , Humans , Immunoglobulin M , Immunosuppressive Agents/therapeutic use , Male , Nucleic Acids
9.
Article in English | WPRIM | ID: wpr-928976

ABSTRACT

OBJECTIVES@#With the continuous generation of new variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the pressure of epidemic prevention and control continues to increase in China. Omicron with stronger infectiousness, immune escape ability and repeated infection ability spread to many countries and regions around the world in a short period of time. China has also successively reported cases of imported Omicron infections. This study aims to understand the epidemiological characteristics of Omicron variant via analyzing the epidemiological characteristics of imported patients with Omicron in Hunan Province, and to provide reference for preventing and controlling the imported epidemics.@*METHODS@#The clinical data of imported patients with coronavirus disease 2019 admitted to Hunan Province from December 16 to December 31, 2021 were retrospectively collected. The epidemiological information, general information, clinical classification, clinical symptoms, vaccination status, and lung CT were analyzed. Nasopharyngeal swabs and blood samples were collected. Virus nucleic acid was detected by magnetic beads method using SARS-CoV-2 detection kit. Ct values of ORF1ab gene and N gene were compared between asymptomatic infected patients and confirmed patients. The specific IgM and IgG antibodies were detected by chemiluminescence assay using SARS-CoV-2 IgM test kit and SARS-CoV-2 IgG test kit, respectively. Ct values of IgM and IgG antibodies were compared between asymptomatic infected patients and confirmed patients.@*RESULTS@#Seventeen patients with Omicron variant infection were treated in Hunan, including 15 confirmed patients (5 common type and 10 mild type) and 2 asymptomatic infection patients. The 17 patients were all Chinese, they were generally young, and 16 were male. There were 9 patients with diseases. Of them 3 patients had respiratory diseases. All 17 patients had completed the whole process of vaccination, but only one person received a booster shot of SARS-CoV-2 vaccine. The clinical manifestations of the patients were mild, mainly including dry/painful/itchy throat, cough, and fatigue. The total protein and creatine in the asymptomatic infection and confirmed cases infected with Omicron variant were all within the normal range, but other biochemical indicators were abnormal. There were the significant differences in C-reactive protein and fibrinogen between asymptomatic infection and confirmed patients (both P<0.05). There were more patients with elevated C-reactive protein in confirmed patients than without confirmed ones. The detection rate of specific IgM and IgG antibodies on admission was 100%, and there was no significant difference in the specific antibody levels between asymptomatic infection and confirmed patients (P>0.05). There were no significant differences in Ct values of ORF1ab gene and N gene (21.35 and 18.39 vs 19.22 and 15.67) between the asymptomatic infection and the confirmed patients (both P>0.05). Only 3 patients had abnormal lung CT, showing a small amount of patchy and cord-like shadows. One of them had no abnormality on admission but had pulmonary lesions and migratory phenomenon after admission.@*CONCLUSIONS@#The patients with Omicron variant tend to be young people and have milder clinical symptoms, but the viral load is high and the infectiveness is strong. Therefore, the timely identification and effective isolation and control for asymptomatic infections and confirmed patients with mild symptoms are extremely important. In terms of epidemic prevention and control, the government still needs to strengthen the risk control of overseas input, adhere to normalized epidemic prevention and control measures, to effectively control the source of infection, cut off the route of transmission, and protect vulnerable people.


Subject(s)
Asymptomatic Infections , C-Reactive Protein , COVID-19/virology , COVID-19 Vaccines , China/epidemiology , Female , Humans , Immunoglobulin G , Immunoglobulin M , Male , Retrospective Studies , SARS-CoV-2
10.
Rev. baiana saúde pública ; 45(3,supl.n.esp): 48-57, 28 dec. 2021.
Article in Portuguese | LILACS | ID: biblio-1352325

ABSTRACT

A rabdomiólise como complicação da dengue é subnotificada e pouco descrita na literatura. O presente caso traz um alerta para recordar tal possibilidade, principalmente devido à alta incidência da dengue no Brasil e da importância do manejo inicial, que pode evitar um desfecho desfavorável. Este relato trata de um paciente de 54 anos que iniciou com quadro agudo de fraqueza, com dor intensa em membros inferiores, dor abdominal, náuseas, vômitos e anúria. Foi observada evidente disfunção renal aguda em urgência dialítica com acidose metabólica grave, além de hiperuricemia, hiponatremia, hipocalcemia e hipercalemia, com valores de creatinofosfoquinase (CPK) de 125.010 e de mioglobina, 318,28. O paciente necessitou de três sessões de hemodiálise e recebeu alta com recuperação da função renal. O resultado da sorologia IgM para dengue foi positivo após um mês e dez dias da admissão hospitalar.


Reports on rhabdomyolysis as a complication of dengue are scarce in the literature. This study warns about such a possibility, especially considering the high incidence of dengue in Brazil and the importance of early management to avoid an unfavorable outcome for the patient. The case consists of a 54-year-old patient admitted to the hospital with complains of acute weakness, severe lower limb pain, abdominal pain, nausea, vomiting, and anuria. Clinical evaluation indicated acute renal dysfunction in dialysis emergency with severe metabolic acidosis, as well as hyperuricemia, hyponatremia, hypocalcemia, and hyperkalemia, with creatine phosphokinase (CPK) values equal to 125.010 and myoglobin to 318.28. The patient was discharged with recovery of renal function after three hemodialysis sessions. Serology results were positive for dengue IgM one month and ten days after hospital admission.


La rabdomiólisis como complicación del dengue está poco implementada en la literatura y poco reportada, y este caso trae una advertencia para recordar esta posibilidad, principalmente por la alta incidencia del dengue en el país en el que vivimos y la importancia del manejo inicial, evitando un desfavorable resultado para el paciente. Se trata de un paciente de 54 años que inicia debilidad aguda, dolor severo en miembros inferiores, dolor abdominal, náuseas, vómitos y anuria. Se evidenció disfunción renal aguda en urgencia de diálisis con acidosis metabólica severa, además de hiperuricemia, hiponatremia, hipocalcemia e hiperpotasemia, con valores de creatinfosfoquinasa (CPK)de 125.010 y mioglobina de 318,28. El paciente requirió tres sesiones de hemodiálisis y fue dado de alta con recuperación de la función renal. El resultado de la serología IgM para el dengue fue positivoun mes y diez días después del ingreso hospitalario.


Subject(s)
Rhabdomyolysis , Immunoglobulin M , Recovery of Function , Dengue , Dialysis
11.
Rev. bras. ginecol. obstet ; 43(12): 887-893, Dec. 2021. tab
Article in English | LILACS | ID: biblio-1357098

ABSTRACT

Abstract Objective The purpose of the present study is to standardize and evaluate the use of the immunoglobulin G (IgG) antibody avidity test on blood samples from newborns collected on filter paper to perform the heel test aiming at its implementation in ongoing programs. Methods Blood samples from newborns were collected on filter paper simultaneously with the heel prick test. All samples were subjected to immunoglobulin M IgM and IgG enzyme-linked immunosorbent assays (ELISA). Peripheral blood was collected again in the traditional way and on filter paper from newborns with high IgG levels (33). Three types of techniques were performed, the standard for measuring IgG in serum, adapted for filter paper and the technique of IgG avidity in serum and on filter paper. The results of the avidity test were classified according to the Rahbari protocol. Results Among the 177 samples, 17 were collected in duplicate from the same child, 1 of peripheral blood and 1 on filter paper. In this analysis, 1 (5.88%) of the 17 samples collected in duplicate also exhibited low IgG avidity, suggesting congenital infection. In addition, the results obtained from serum and filter paper were in agreement, that is, 16 (94.12%) samples presented high avidity, with 100% agreement between the results obtained from serum and from filter paper. Conclusion The results of the present study indicate that the avidity test may be another valuable method for the diagnosis of congenital toxoplasmosis in newborns.


Resumo Objetivo O objetivo do presente estudo é padronizar e avaliar a utilização do teste de avidez de anticorpos imunoglobulina G (IgG) em amostras de sangue de recémnascidos (RNs) coletadas em papel filtro para a realização do teste do pezinho visando a implementação nos programas já vigentes. Métodos Foram coletadas amostras de sangue de recém-nascidos em papel filtro simultaneamente ao teste do pezinho. Em todas as amostras, foram realizados os testes imunoenzimáticos (ELISA) imunoglobulina M (IgM) e IgG. Dos RNs que apresentaram altos índices de IgG (33), foi novamente coletado sangue periférico da forma tradicional e em papel filtro. Foram realizadas técnicas padrão para a dosagem de IgG em soro, adaptadas para papel filtro, e a técnica de avidez de IgG em soro e em papel filtro. Os valores obtidos para o teste de avidez foram classificados de acordo com o protocolo de Rahbari. Resultados Dentre as 177 recoletas, em 17 amostras foi realizada a coleta simultânea de sangue periférico e papel filtro da mesma criança. Nesta análise, 1 (5,88%) das 17 amostras coletadas em duplicata obteve também baixa avidez de IgG, sugerindo infecção congênita da criança, e houve concordância entre os resultados obtidos em soro e em papel filtro: 16 (94,12%) das amostras apresentaram alta avidez, com concordância de 100% entre os resultados obtidos em soro e em papel filtro. Conclusão Os dados do presente trabalho evidenciam que o teste de avidez poderá ser mais um método valioso a ser utilizado no diagnóstico da toxoplasmose congênita em RNs.


Subject(s)
Humans , Infant, Newborn , Toxoplasma , Immunoglobulin G , Toxoplasmosis, Congenital/diagnosis , Immunoglobulin M , Antibodies, Protozoan , Early Diagnosis
12.
Arq. Asma, Alerg. Imunol ; 5(4): 426-432, out.dez.2021. ilus
Article in English, Portuguese | LILACS | ID: biblio-1399808

ABSTRACT

Relatamos o caso de um paciente do sexo masculino, que iniciou quadro de úlceras em trato gastrointestinal, associado a febre recorrente e diarreia com muco e sangue aos 10 meses de vida, suspeitado inicialmente de doença inflamatória intestinal, no entanto, não apresentou melhora do quadro com terapia imunossupressora, sendo realizada investigação para erro inato da imunidade. Nos exames laboratoriais, apresentou níveis baixos de IgG e IgA e níveis elevados de IgM e neutropenia persistente. Diante disso, foi realizado teste genético que confirmou diagnóstico de síndrome de hiper-IgM ligada ao X. Os erros inatos da imunidade podem se manifestar com doenças do trato gastrointestinal, de forma relativamente frequente, devendo entrar como diagnóstico diferencial de diarreia crônica. Inclusa nesse grupo de doenças, as síndromes de hiper-IgM constituem um grupo heterogêneo de doenças, possuindo em comum níveis significativamente baixos ou ausentes de IgG e IgA e níveis normais ou elevados de IgM, o que predispõe a infecções e febre recorrente; além de outras alterações laboratoriais, como neutropenia, que pode estar associada a úlceras no trato gastrointestinal e proctite, simulando apresentação clínica de doença inflamatória intestinal. Para o paciente relatado, foi iniciada terapia com imunoglobulinas de forma periódica, além de antibioticoprofilaxia para infecções, evoluindo com resposta clínica satisfatória. O artigo possui objetivo principal de alertar para o diagnóstico diferencial de erros inatos da imunidade diante do quadro apresentado, visando o diagnóstico precoce e a instituição da terapia adequada.


We report the case of a male patient, who started with ulcers in the gastrointestinal tract, associated with recurrent fever and diarrhea with mucus and blood at 10 months of life, initially suspected of inflammatory bowel disease, however, he did not improve the condition with immunosuppressive therapy, being investigated for inborn error of immunity. In laboratory tests, he had low levels of IgG and IgA and high levels of IgM and persistent neutropenia. Therefore, a genetic test was performed and confirmed the diagnosis of X-linked hyper IgM syndrome. Inborn errors of immunity can manifest relatively frequently with diseases of the gastrointestinal tract, and should be included as a differential diagnosis of chronic diarrhea. Included in this group of diseases, hyper-IgM syndromes constitute a heterogeneous group of diseases, having in common significantly low or absent levels of IgG and IgA and normal or high levels of IgM, which predispose to infections and recurrent fever; in addition to other laboratory alterations, such as neutropenia, which may be associated with ulcers in the gastrointestinal tract and proctitis, simulating the clinical presentation of inflammatory bowel disease. For the reported patient, therapy with immunoglobulins was started periodically, in addition to antibiotic prophylaxis for infections, evolving with a satisfactory clinical response. The main objective of the article is to alert to the differential diagnosis of inborn errors of immunity in view of the presented condition, aiming at early diagnosis and the institution of adequate therapy.


Subject(s)
Humans , Male , Infant , Immunoglobulin M , Inflammatory Bowel Diseases , Diagnosis, Differential , Hyper-IgM Immunodeficiency Syndrome, Type 1 , Relapsing Fever , Ulcer , Immunoglobulin A , Immunoglobulin G , Immunosuppression Therapy , Antibiotic Prophylaxis , Early Diagnosis , Dihydrotachysterol , Infections
13.
Rev. chil. infectol ; 38(5): 716-719, oct. 2021. tab
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1388290

ABSTRACT

Resumen La determinación de anticuerpos anti virus hepatitis E (anti-VHE) tiene gran variabilidad dependiendo del ensayo utilizado. En 2015, con un método ELISA manual, publicamos una seroprevalencia de anti-VHE IgG de 32,6% en pacientes con estudio de hepatitis. Existen escasas publicaciones de anti-VHE IgM. Recientemente, se desarrolló el primer método automatizado y en el presente estudio comunicamos la experiencia obtenida. Se analizaron los resultados de 272 pacientes con estudio de anti-VHE IgG y/o IgM mediante técnica automatizada ELFA (VIDAS®), entre mayo de 2018 y agosto de 2020. Se encontró 25,8% (68/264) de positividad para anti-VHE IgG y 3,5% (9/259) para anti-VHE IgM. Cuatro muestras tuvieron ambos anticuerpos positivos. La seropositividad de anti-VHE IgG aumentó con la edad. En conclusión, la seroprevalencia de anti-VHE IgG obtenida fue similar a la publicada previamente. Considerando las ventajas de los ensayos IgM e IgG anti-VHE en el sistema VIDAS®, parecen ser nuevas herramientas valiosas en el estudio serológico de VHE.


Abstract The determination of anti-hepatitis E virus antibodies (anti-HEV) has a high variability depending on the assay used. In 2015, with a manual ELISA method, we reported anti-HEV IgG seroprevalence of 32.6% in patients under hepatitis study. There are few reports of anti-HEV IgM. Recently, it was developed the first automated method and in the present study, we report the experience using this new method. Between May 2018 and August 2020, the results of 272 patients with an anti-HEV IgG and/or IgM study were analyzed using the automated ELFA technique (VIDAS®). Seroprevalence was 25.8% (68/264) for anti-HEV IgG and 3.5% (9/259) for anti-HEV IgM. Four samples were positive for both antibodies. Anti-HEV IgG seropositivity increased with age. In conclusion, the seroprevalence of anti-HEV IgG obtained was similar to previously reported. Taking into account the advantages of these assays, anti-HEV IgM and IgG assays on VIDAS® system, seem to be valuable new tools in serological study of HEV.


Subject(s)
Humans , Male , Female , Infant , Child, Preschool , Child , Adolescent , Adult , Middle Aged , Aged , Aged, 80 and over , Young Adult , Hepatitis E virus , Hepatitis E/diagnosis , Hepatitis E/epidemiology , Immunoglobulin G , Immunoglobulin M , Hepatitis Antibodies , Seroepidemiologic Studies , Cross-Sectional Studies , Hospitals, University
14.
Arch. argent. pediatr ; 119(4): e335-e339, agosto 2021. ilus
Article in Spanish | LILACS, BINACIS | ID: biblio-1281757

ABSTRACT

La nefropatía por inmunoglobulina M (NIgM) es una glomerulopatía idiopática caracterizada por depósitos mesangiales globales y difusos de IgM. Se realizó un estudio retrospectivo de las características clínicas e histopatológicas de los pacientes con NIgM atendidos en nuestro servicio. De 241 biopsias renales, 21 correspondieron a NIgM (8,7 %). Se incluyeron 18 pacientes (14 de sexo femenino, mediana de edad: 3,08 años). Se excluyó a 1 paciente por enfermedad sistémica asociada y a 2 por seguimiento menor a 1 año. Catorce pacientes se manifestaron con síndrome nefrótico (SN) y 4 con proteinuria aislada o asociada a hematuria. En la microscopia óptica, 13 presentaron hiperplasia mesangial, y 5 esclerosis focal y segmentaria. De los pacientes con SN, 7 fueron corticorresistentes, 4 corticodependientes y 3 presentaban recaídas frecuentes. Todos los pacientes con SN y 1 con proteinuria-hematuria recibieron inmunosupresores; los 18 pacientes recibieron, además, antiproteinúricos. Luego de 5,2 años (2-17,5) de seguimiento, 6 pacientes evolucionaron a enfermedad renal crónica


Immunoglobulin M nephropathy (IgMN) is an idiopathic glomerulopathy characterized by diffuse global mesangial deposits of IgM. We retrospectively studied the clinical and histopathological characteristics of the patients with IgMN seen in our service. Of 241 renal biopsies, 21 corresponded to IgMN (8.7 %). One patient was excluded due to associated systemic disease and 2 due to follow-up less than 1 year, 18 were included (14 girls, median age 3.08 years). Fourteen manifested with nephrotic syndrome (NS) and the remaining with proteinuria (isolated or associated with hematuria). On light microscopy, 13 had hyperplasia with mesangial expansion and 5 had focal and segmental sclerosis. Of the patients with NS, 7 were steroid-resistant, 4 steroid-dependent, and 3 frequent relapsers. All patients with NS and 1 with proteinuria-hematuria received immunosuppressants; the 18 patients also received antiproteinuric drugs. After 5.2 years (2-17.5) of follow-up, 6 patients developed chronic kidney disease.


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Immunoglobulin M , Nephrotic Syndrome/pathology , Nephrotic Syndrome/therapy , Kidney Diseases , Nephrotic Syndrome/diagnosis
15.
Rev. bras. anal. clin ; 53(2): 138-142, 20210630. ilus
Article in Portuguese | LILACS | ID: biblio-1348698

ABSTRACT

A pandemia da COVID-19 tem tido um impacto devastador em todo o mundo e levou ao rápido desenvolvimento de testes diagnósticos. Diferentes tecnologias vêm sendo utilizadas para a detecção de imunoglobulinas frente à infecção por SARS-CoV-2. Ensaios imunoenzimáticos (ELISA), quimioluminescentes e imunocromatográficos estão disponíveis e, no geral, apresentam poder diagnóstico limitado, principalmente para a detecção de IgA. A citometria de fluxo tem surgido como alternativa para o desenvolvimento de métodos sensíveis e específicos para a COVID-19 aplicados para diagnóstico, triagem e estratificação da doença. A citometria de fluxo é uma tecnologia óptica baseada em laser que detecta características físico-químicas de células ou partículas em um fluido heterogêneo. O artigo explora a citometria de fluxo para o diagnóstico da COVID-19 em duas estratégias para a detecção de anticorpos no soro ou plasma, uma utilizando antígenos virais expressos na superfície de células de mamíferos e outra com estes elementos imobilizados em microesferas (beads). A possibilidade de detecção rápida de múltiplos anticorpos simultaneamente, com pequeno volume de amostra e elevada sensibilidade e especificidade, torna a citometria de fluxo uma metodologia promissora para o laboratório clínico, como ferramenta de referência para auxiliar na contenção do processo pandêmico da COVID-19 e futuros eventos similares.


The COVID-19 pandemic has had a devastating impact around the world and has led to the rapid development of diagnostic tests. Different technologies have been used to detect immunoglobulins produced against SARS-CoV-2 infection. Immunoenzymatic (ELISA), chemiluminescent and immunochromatographic assays are available and, in general, they have limited diagnostic accuracy, especially for the detection of IgA. Flow cytometry has emerged as an alternative for the development of sensitive and specific methods for COVID-19 applied for diagnosis, screening and stratification of the disease. Flow cytometry is a laser-based optical technology that detects physicochemical characteristics of cells or particles in a heterogeneous fluid. The article explores flow cytometry for the diagnosis of COVID-19 in two strategies for detecting antibodies in serum or plasma, the first one using viral antigens expressed on the surface of mammalian cells and the other one with these elements immobilized on microspheres (beads). The possibility of rapid detection of multiple antibodies simultaneously, with a small sample volume and high sensitivity and specificity, makes flow cytometry a promising methodology for the clinical laboratory, as a reference tool to help stop the COVID-19 pandemic process and similar future events.


Subject(s)
Immunoglobulin A , Immunoglobulin G , Immunoglobulin M , Flow Cytometry , SARS-CoV-2 , COVID-19
16.
Rev. bras. anal. clin ; 53(2): 155-162, 20210630. ilus, tab
Article in Portuguese | LILACS | ID: biblio-1349033

ABSTRACT

A rápida caracterização do genoma do Coronavírus-2 (SARS-CoV-2) mobilizou a produção em larga escala de métodos diagnósticos. Agências reguladoras aprovaram condicionalmente o uso emergencial de vários deles. Na emergência de saúde, inúmeros exames foram utilizados sem o devido conhecimento da qualidade. O objetivo desta revisão narrativa foi destacar a acurácia diagnóstica dos métodos sorológicos de diagnóstico da COVID-19 em termos de sensibilidade e especificidade clínicas. A sensibilidade diagnóstica variou até 50% entre estudos, enquanto a especificidade apresentou menor variação; no entanto, uma mesma marca chegou a apresentar variação de 32%. Considerando-se o critério de especificidade >95% definido pelo FDA, apenas uma marca de ensaio para detecção de IgG e outra para IgM atingiram a meta. Para a detecção de IgA e de IgA+IgM, as únicas marcas apresentadas não atingiram a meta. Entre as cinco marcas para detecção de IgM+IgG, apenas uma não atingiu a especificidade clínica. Para Ig total, as duas marcas apresentaram especificidade aceitável. Considerando-se o critério de sensibilidade clínica >90%, apenas 6 dos 25 estudos com diferentes marcas de ensaios para detecção de IgG apresentam o desempenho especificado; destas, nenhuma é brasileira. Nenhuma das marcas de ensaios para detecção de IgM e IgM+IgG apresentaram o desempenho especificado. A única marca apresentada para detecção de IgA+IgM atingiu a meta especificada pelo FDA. Os ensaios imunocromatográficos apresentaram menor sensibilidade. Os resultados demonstraram o pobre valor diagnóstico dos imunoensaios, mas com potencial para estudos soroepidemiológicos. Mais estudos de validação analítica e acurácia diagnóstica de ensaios são essenciais, principalmente dos reagentes nacionais.


The rapid characterization of the coronavirus-2 (SARS-CoV-2) genome has mobilized the large-scale production of diagnostic methods. Regulatory agencies have conditionally approved the emergency use of several of them. In the health emergency, numerous tests were used without proper knowledge of quality. The aim of this narrative review was to highlight the diagnostic accuracy of serological methods for the diagnosis of COVID-19 in terms of clinical sensitivity and specificity. The diagnostic sensitivity varied up to 50% between studies, while the specificity showed less variation, however, the same brand even showed a variation of 32%. Considering the >95% specificity criteria defined by the FDA, only one test brand for detection of IgG and one for IgM reached the goal. For the detection of IgA and IgA+IgM, the only brands presented did not reach the goal. Among the 5 marks for detecting IgM+IgG, only one did not reach clinical specificity. For total Ig, both brands had acceptable specificity. Considering the criterion of clinical sensitivity >90%, only 6 of the 25 studies with different brands of assays for detection of IgG present the specified performance, none of which are Brazilian. None of the brands of assays for detecting IgM and IgM+IgG showed the specified performance. The only brand presented for detection of IgA+IgM reached the target specified by the FDA. Immunochromatographic assays showed lower sensitivity. The results demonstrated the poor diagnostic value of immunoassays, but with potential for seroepidemiological studies. More studies on analytical validation and diagnostic accuracy of assays are essential, especially for national reagents.


Subject(s)
Immunoglobulin G , Immunoglobulin M , Serologic Tests , Data Accuracy , SARS-CoV-2 , COVID-19/diagnosis
17.
Rev. bras. ginecol. obstet ; 43(5): 351-356, May 2021. tab
Article in English | LILACS | ID: biblio-1288563

ABSTRACT

Abstract Objective Most prenatal screening programs for toxoplasmosis use immunoassays in serum samples of pregnant women. Few studies assess the accuracy of screening tests in dried blood spots, which are of easy collection, storage, and transportation. The goals of the present study are to determine the performance and evaluate the agreement between an immunoassay of dried blood spots and a reference test in the serum of pregnant women from a population-based prenatal screening program for toxoplasmosis in Brazil. Methods A cross-sectional study was performed to compare the immunoassays Imunoscreen Toxoplasmose IgM and Imunoscreen Toxoplasmose IgG (Mbiolog Diagnósticos, Ltda., Contagem, Minas Gerais, Brazil)in dried blood spots with the enzymelinked fluorescent assay (ELFA, BioMérieux S.A., Lyon, France) reference standard in the serum of pregnant women from Minas Gerais Congenital Toxoplasmosis Control Program. Results The dried blood spot test was able to discriminate positive and negative results of pregnant women when comparedwith the reference test, with an accuracy of 98.2% for immunoglobulin G (IgG), and of 95.8% for immunoglobulin M (IgM). Conclusion Dried blood samples are easy to collect, store, and transport, and they have a good performance,making this a promisingmethod for prenatal toxoplasmosis screening programs in countries with continental dimensions, limited resources, and a high prevalence of toxoplasmosis, as is the case of Brazil.


Resumo Objetivo A maioria dos programas de triagem pré-natal para toxoplasmose utiliza imunoensaios em amostras de soro de gestantes. Poucos estudos avaliam a acurácia dos testes de triagem em amostras de sangue seco, que são de fácil coleta, armazenamento e transporte. Este estudo teve como objetivo determinar o desempenho e avaliar a concordância entre um imunoensaio em sangue seco e um teste de referência em soro de gestantes de um programa de rastreamento pré-natal de base populacional para toxoplasmose no Brasil. Métodos Realizou-se um estudo transversal para comparar os imunoensaios Imunoscreen Toxoplasmose IgM e Imunoscreen Toxoplasmose IgG (Mbiolog Diagnósticos, Ltda., Contagem, Minas Gerais, Brazil) em sangue seco com o padrão de referência ensaio fluorescente ligado a enzimas (enzyme-linked fluorescent assay, ELFA, BioMérieux S.A., Lion, França) no soro de gestantes do Programa de Controle de Toxoplasmose Congênita de Minas Gerais. Resultados O exame em sangue seco foi capaz de discriminar os resultados positivos e negativos das gestantes quando comparado ao teste de referência, com acurácia de 98,2% para imunoglobulina G (IgG), e de 95,8% para imunoglobulina M (IgM). Conclusão O sangue seco apresenta bom desempenho e é uma amostra de fácil coleta, armazenamento e transporte, o que o torna um método promissor para programas de triagem pré-natal de toxoplasmose em países com dimensões continentais, recursos limitados, e alta prevalência de toxoplasmose, como é o caso do Brasil.


Subject(s)
Humans , Female , Pregnancy , Toxoplasma/isolation & purification , Toxoplasmosis/diagnosis , Toxoplasmosis, Congenital/diagnosis , Immunoenzyme Techniques/methods , Dried Blood Spot Testing/methods , Prenatal Diagnosis , Toxoplasma/immunology , Brazil/epidemiology , Immunoglobulin G/blood , Immunoglobulin M/blood , Antibodies, Protozoan/blood , Toxoplasmosis/epidemiology , Toxoplasmosis, Congenital/epidemiology , Mass Screening , Population Surveillance , Prevalence , Cross-Sectional Studies , Pregnant Women
18.
Arq. bras. cardiol ; 116(4): 844-849, abr. 2021. tab, graf
Article in Portuguese | LILACS | ID: biblio-1285189

ABSTRACT

Fundamento: Fatores de risco definidos para HIV e tradicionais podem estar associados a um aumento de eventos cardiovasculares. Estudos recentes sugerem que a resposta imune humoral à LDL modificada pode estar associada ao processo de aterosclerose. Objetivos: Avaliar a presença de anti-LDL oxidada e de peptídeos derivados da Apolipoproteína B no sangue, bem como sua associação à função endotelial na infecção por HIV. Métodos: Este estudo incluiu consecutivamente sujeitos com idade, sexo e dados demográficos correspondentes em dois grupos: (1) indivíduos infectados com HIV e naïve para terapia antiviral e (2) indivíduos não infectados. A aterosclerose subclínica foi avaliada pela espessura íntima-média, utilizando-se a ultrassonografia das artérias carótidas. A função endotelial foi determinada pela dilatação mediada por fluxo (DMF) da artéria braquial por ultrassonografia. Os níveis de autoanticorpos (IgM, IgG) de lipoproteínas de baixa densidade antioxidadas (LDL-ox), fragmentos de peptídeos antiapolipoproteína B (peptídeos ApoB-D e 0033G-Cys), e citocina foram avaliados por meio de ELISA. Resultados: Os resultados deste estudo não mostraram diferenças na aterosclerose subclínica entre os grupos. Entretanto, os sujeitos infectados com HIV apresentaram uma DMF mais baixa, em comparação com os sujeitos não infectados. Portanto, os sujeitos infectados com HIV apresentaram níveis mais altos de citocinas inflamatórias, títulos de IgG anti-LDL-ox, e IgG anti-ApoB-D. Em contraste, títulos de IgM anti-ApoB-D foram mais baixos em indivíduos infectados com HIV e associados a funções endoteliais diminuídas. Conclusões: Os resultados deste estudo mostram que a infecção por HIV, em sujeitos naïve, está associada à disfunção endotelial e à diminuição de anticorpos naturais para antígenos Apo-B.


Abstract Backgorund: Traditional and HIV-defined risk factors may be associated with an increase in cardiovascular events. Recent studies have suggested that the humoral immune response to modified LDL may be associated with the process of atherosclerosis. Objectives: To evaluate the presence of anti-oxLDL and apolipoprotein B-derived peptides in the blood, and their association with the endothelial function in HIV-infection. Methods: This study consecutively included subjects matched for age, gender, and demographic data in two groups: (1) HIV-infected and naïve for antiviral therapy and (2) uninfected individuals. Subclinical atherosclerosis was assessed by intimal-media thickness, using ultrasonography of the carotid arteries. Endothelial function was determined by flow-mediated dilatation (FMD) of the brachial artery by ultrasonography. Autoantibodies (IgM, IgG) anti-oxidized low-density lipoprotein (oxLDL), anti-apolipoprotein B-peptide fragments (ApoB-D and 0033G-Cys peptides), and cytokine levels were evaluated by ELISA. Results: This study's results showed no difference in subclinical atherosclerosis between groups; however, HIV-infected subjects showed a lower FMD, when compared to non-infected subjects. Therefore, HIV-infected subjects showed higher levels of inflammatory cytokines, titers of IgG anti-oxLDL, and IgG anti-ApoB-D. In contrast, titers of IgM anti-ApoB-D were lower in HIV-infected individuals and associated with reduced endothelial functions. Conclusions: This study's results show that HIV infection, in naïve subjects, is associated with endothelial dysfunction and a decline of natural antibodies to apo-B antigens.


Subject(s)
Humans , Autoantigens , HIV Infections , Apolipoproteins B , Immunoglobulin G , Immunoglobulin M , Lipoproteins, LDL
19.
Rev. chil. infectol ; 38(2): 212-217, abr. 2021. tab, graf
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1388219

ABSTRACT

INTRODUCCIÓN: Toxoplasma gondii es un protozoo que afecta a un tercio de la población mundial y cuya seroprevalencia actualizada en niños con cáncer en nuestro medio, se desconoce. OBJETIVO: Describir la seroprevalencia de IgG anti-T. gondii en población pediátrica con cáncer atendida en hospitales públicos de la Región Metropolitana, Chile. MÉTODO: Estudio transversal de pacientes pediátricos oncológicos atendidos en la ciudad de Santiago. Se tomó una muestra de suero de 100 pacientes entre junio de 2016 y mayo de 2019. Se les realizó ELISA IgG T. gondii. RESULTADOS: Se analizaron 100 muestras, 51% de sexo masculino. Resultaron 12 positivas, 84 negativas y 4 indeterminadas. Los sueros de los pacientes se estratificaron por edad: 0-5 años 43%, 6-10 años 29%, 11-15 años 20% y > 15 años, 8%. El 61% eran pacientes con leucemia aguda. El porcentaje de mujeres con IgG positiva fue de 21% en comparación a 4% en hombres (P < 0,0011). CONCLUSIÓN: El 84% de los niños en tratamiento por cáncer son seronegativos para T. gondii, por lo que es importante educar en la prevención de la adquisición de este parásito en esta población, por el riesgo de desarrollar enfermedad grave con riesgo de muerte.


BACKGROUND: Toxoplasma gondii is a protozoan that affects a third of the world population and whose updated seroprevalence in children with cancer in our environment is unknown. AIM: To describe the seroprevalence of IgG anti-T. gondii in pediatric population with cancer treated in hospitals of the Metropolitan Region, Chile. METHOD: Cross-sectional study of the population of pediatric cancer patients treated in Santiago city, A serum sample was taken from 100 patients between June 2016 and May 2019. ELISA IgG T. gondii was performed. RESULTS: Of 100 children, 51% male. 12 were positive (12%), 84 negative (84%) and 4 indeterminate (4%). The stratification by age showed 43% patients between 0-5 years, 29% between 6-10 years, 20% in the group of 11-15 years and 8% in patients > 15 years. Sixty one percent of the samples came from patients with acute leukemia. The percentage of women who tested positive for IgG was 21% compared to 4% in men (P < 0.0011). CONCLUSION: 84% of children undergoing cancer treatment are seronegative for T. gondii, so it is important to educate on the prevention of the acquisition of this parasite in this population, due to the risk of developing serious and fatal disease.


Subject(s)
Humans , Male , Female , Infant, Newborn , Infant , Child, Preschool , Child , Adolescent , Toxoplasma , Toxoplasmosis/epidemiology , Neoplasms/epidemiology , Antineoplastic Agents , Immunoglobulin G , Immunoglobulin M , Antibodies, Protozoan , Seroepidemiologic Studies , Chile/epidemiology , Cross-Sectional Studies , Risk Factors , Cities
20.
Actual. SIDA. infectol ; 29(105): 17-26, 2021 mar. fig, graf
Article in Spanish | LILACS, BINACIS | ID: biblio-1349031

ABSTRACT

Con el propósito de ampliar el conocimiento epidemiológico sobre la circulación del SARS-CoV-2 en la ciudad de Ushuaia durante el brote ocurrido de marzo a mayo de 2020, nos planteamos realizar un estudio observacional, de corte transversal, de mayo a julio, buscando la respuesta serológica al contacto con el virus en trabajadores esenciales municipales. N=1305. Los datos fueron ingresados a una plataforma con ingreso restringido, para luego cruzar las variables obtenidas en formato Excel. La mayoría de las personas estudiadas fueron de género masculino, con una media de edad de 38,5 años. El 20% de las personas con IgG+ tuvieron nexo epidemiológico. La prevalencia fue del 2,75%. Quienes presentaron IgM+ fueron descartados por otro método, considerándose falsos positivos. La idea y realización en forma precoz del estudio fue útil para evaluar la diseminación viral asintomática en el personal municipal afectado a tareas esenciales y tomar decisiones en las primeras etapas de la pandemia. No se encontraron diferencias significativas en los grupos más expuestos. Se observaron casos de transmisión asintomática intrafamiliar. Estas pruebas serológicas no tienen fines diagnósticos ni confieren un pasaporte inmunitario. Pudimos establecer la confiabilidad de la técnica utilizada, fundamentalmente en relación a la IgG. El método se optimizó. Consideramos que las políticas públicas basadas en evidencias científicas permiten tomar mejores decisiones en beneficio de la comunidad. Creemos que el presente estudio aporta al estado de comprensión en la materia. Cada reporte puede ser de utilidad para el conocimiento de la diseminación viral


With the purpose of expanding epidemiological knowledge about the circulation of SARS-CoV-2 in the city of Ushuaia during the outbreak that occurred from March to May of this current, we plan to carry out an observational, cross-sectional study from May to July, seeking the serological response to contact with the virus in essential municipal workers. N = 1316. The data were entered into a platform with restricted entry, to later cross the variables obtained in Excel format. Most of the people studied were male, with a mean age of 38 years. 20% of the people with IgG + had an epidemiological link. The prevalence was 2.88%. Those who presented IgM+ were discarded by another method, being considered false positives. The early idea and implementation of the study was useful to evaluate asymptomatic viral shedding in municipal personnel affected by essential tasks and to make decisions in the early stages of the pandemic. No significant differences were found in the most exposed groups. Cases of asymptomatic interfamily transmission were observed. These serological tests do not have diagnostic purposes nor do they confer an immune passport. We were able to establish the reliability of the technique used, mainly in relation to IgG. The method was optimized. We believe that public policies based on scientific evidence allow us to make better decisions for the benefit of the community. We believe that the present study contributes to the state of understanding in the matter. Each report can be useful for understanding viral shedding.


Subject(s)
Humans , Adult , Immunoglobulin G/immunology , Immunoglobulin M/immunology , Cross-Sectional Studies , Health Personnel , Virus Shedding/immunology , Municipal Management , COVID-19 Serological Testing , COVID-19/epidemiology
SELECTION OF CITATIONS
SEARCH DETAIL