Características clinicoepidemiológicas de pacientes con evolución asintomática de la COVID-19 en la provincia de Santiago de Cuba / Clinical and epidemiological characteristics of patients with asymptomatic clinical course of COVID-19 in Santiago de Cuba province

Introducción: La COVID-19 es una enfermedad infecciosa causada por el virus SARS-CoV-2, la cual se presenta de forma asintomática en hasta 80 % de los casos a nivel mundial. Objetivo: Caracterizar a los pacientes con evolución asintomática de la COVID-19. Métodos: Se realizó un estudio observacional, descriptivo y transversal en la provincia de Santiago de Cuba, con recolección retrospectiva de la información, de marzo a mayo del 2020, de 13 pacientes con la enfermedad que no manifestaron cuadro sintomático de esta al establecer el diagnóstico. Resultados: De los pacientes que dieron positivo por coronavirus en la provincia, 26,0 % estaban asintomáticos; en estos últimos predominaron los grupos etarios de 20-39 años (38,4 %) y de 60 y más años (30,7 %), así como el sexo femenino (84,6 %). Igualmente, 30,7 % padecía enfermedades crónicas no trasmisibles y 38,5 % resultó ser fuente de contagio a otras personas. Conclusiones: La frecuencia de pacientes asintomáticos en Santiago de Cuba fue diferente de la notificada en el resto del país y en otras naciones, lo cual pudo estar condicionado por la no aparición de episodios o brotes y la baja incidencia registrada; no obstante, en el análisis de las variables no existieron discrepancias con los informes sobre pacientes con esta forma clínica de la enfermedad.

Introduction: The COVID-19 is an infectious disease caused by the SARS-CoV-2 virus, which is presented in an asymptomatic way in up to 80 % of the cases at world level. Objective: To characterize the patients with asymptomatic clinical course of the COVID-19. Methods: An observational, descriptive and cross-sectional study was carried out in Santiago de Cuba province, with retrospective gathering of the information, from March to May, 2020, belonging to 13 patients with diagnosis of the disease and no symptomatic manifestation of it. Results: Of the patients with positive results for coronavirus in the province, 26,0 % were asymptomatic; there was a predominance of the 20-39 years-old (38,4 %), and the 60 and more years (30,7 %) in these age groups, as well as of the female sex (84,6 %). Equally, 30,7 % suffered from non-communicable chronic diseases and 38,5 % turned out to be infection source to other people. Conclusions: The frequency of asymptomatic patients in Santiago de Cuba was different from that notified in the rest of the country and in other nations, which could be conditioned by the absence of episodes or outbreaks and the low registered incidence; nevertheless, in the analysis of the variables there were no discrepancies with the reports on patients with this clinical form of the disease.

Sequential serological surveys in the early stages of the coronavirus disease epidemic: limitations and perspectives

Abstract INTRODUCTION: Estimates of the number of individuals infected by severe acute respiratory syndrome coronavirus 2 are important for health planning and establishment of expectations regarding herd immunity. METHODS: Seven testing rounds of a serological survey were conducted at 1-week intervals between April 19 and May 31, 2020 in Teresina municipality. RESULTS Over the 7 weeks, serological positivity increased from 0.56% (95% confidence interval [CI]: 0.18%-1.30%) to 8.33% (95% CI: 6.61%-10.33%), representing 33-53 persons infected for each reported case. CONCLUSIONS: Serological screening may be an important tool for understanding the immunity of a population and planning community interventions.

High frequency of silent brain infarcts associated with cognitive deficits in an economically disadvantaged population

OBJECTIVE: Using magnetic resonance imaging, we aimed to assess the presence of silent brain vascular lesions in a sample of apparently healthy elderly individuals who were recruited from an economically disadvantaged urban region (São Paulo, Brazil). We also wished to investigate whether the findings were associated with worse cognitive performance. METHODS: A sample of 250 elderly subjects (66-75 years) without dementia or neuropsychiatric disorders were recruited from predefined census sectors of an economically disadvantaged area of Sao Paulo and received structural magnetic resonance imaging scans and cognitive testing. A high proportion of individuals had very low levels of education (4 years or less, n=185; 21 with no formal education). RESULTS: The prevalence of at least one silent vascular-related cortical or subcortical lesion was 22.8% (95% confidence interval, 17.7-28.5), and the basal ganglia was the most frequently affected site (63.14% of cases). The subgroup with brain infarcts presented significantly lower levels of education than the subgroup with no brain lesions as well as significantly worse current performance in cognitive test domains, including memory and attention (p<0.002). CONCLUSIONS: Silent brain infarcts were present at a substantially high frequency in our elderly sample from an economically disadvantaged urban region and were significantly more prevalent in subjects with lower levels of education. Covert cerebrovascular disease significantly contributes to cognitive deficits, and in the absence of magnetic resonance imaging data, this cognitive impairment may be considered simply related to ageing. Emphatic attention should be paid to potentially deleterious effects of vascular brain lesions in poorly educated elderly individuals from economically disadvantaged environments.

Asymptomatic vertebral fractures in patients with low bone mineral density / Fraturas vertebrais assintomáticas em indivíduos com baixa massa óssea

Summary Objective: Vertebral fracture assessment (VFA) is a test technique that can be used to detect asymptomatic vertebral fractures (AVF). It uses dual energy X-ray bsorptiometry (DXA) and can be performed concurrently with bone densitometry. This study aims to assess the prevalence of AVF in patients with low bone mass. Methods: Cross-sectional study including 135 individuals with low bone mineral density (BMD) with a T-score < -2.0 standard deviation (SD) in a densitometry clinic located in the city of Blumenau (state of Santa Catarina). Anthropometric, clinical and lifestyle variables were obtained from history-taking and physical examination. Densitometric variables were obtained by bone mineral densitometry and VFA (Explorer, Hollogic®). Vertebral fractures were classified according to the Genant criteria. Student's t, chi-square and logistic regression were performed for statistical analysis. Results: AVFs occurred in 24.4% of the subjects. They were older compared to those without AVF (65±9.25 versus 60.1±8.66; p=0.005), and had a history of lowimpact fractures (38.24% versus 19.8%; OR 2.5; p=0.03). Half of the patients that reported steroid therapy had AVFs, compared to one fifth of those who did not use steroids (50% versus 21.49%; OR 3.6; p=0.01). Conclusion: Asymptomatic vertebral fractures were present in approximately one fourth of patients. The risk factors associated were history of low-impact fracture, use of steroids and age > 61 years.

Resumo Objetivos: vertebral fracture assessment (VFA) é uma técnica de exame que pode ser aplicada na detecção de fraturas vertebrais assintomáticas (FVA). Utiliza absorciometria de raios-X de dupla energia (DXA) e pode ser realizada concomitantemente ao exame de densitometria óssea. Este estudo visa a avaliar a prevalência de FVA em indivíduos com baixa massa óssea. Métodos: estudo transversal realizado em 135 indivíduos, com baixa densidade mineral óssea (DMO), com T-score < -2,0 desvio padrão (DP), em uma clínica de densitometria de Blumenau (SC). As variáveis antropométricas, clínicas e referentes ao estilo de vida foram obtidas por anamnese e exame clínico; as variáveis densitométricas foram obtidas por DMO e VFA (aparelho modelo Explorer, marca Hollogic®). As fraturas vertebrais foram classificadas de acordo com os critérios de Genant. Os testes estatísticos foram t de student, qui-quadrado e regressão logística. Resultados: FVA ocorreram em 24,4% dos indivíduos. A idade desses indivíduos foi superior à dos indivíduos sem FVA (65±9,25 vs. 60,1±8,66; p=0,005), assim como o antecedente de fratura por baixo impacto (38,24% vs.19,8%; OR 2,5; p=0,03). A metade dos indivíduos que relataram corticoterapia possuíam FVA, contrastando com um quinto dos indivíduos sem corticoterapia (50% vs. 21,49%; OR 3,6; p=0,01). Conclusão: fraturas vertebrais assintomáticas estiveram presentes em aproximadamente um quarto dos pacientes. Os fatores de risco associados foram história de fratura por baixo impacto, corticoterapia e idade > 61 anos.

Association between antiretrovirals and thyroid diseases: a cross-sectional study

Objective This study aims to estimate the prevalence of thyroid diseases and anti-TPO status. We searched for an association among presence of immune reconstitution and use of stavudine, didanosine and protease inhibitors with thyroid diseases. Materials and methods A cross-sectional study was performed to analyze the records of 117 HIV-infected patients who had their CD4+ cell count, viral load, anti-TPO, TSH and free T4 levels collected on the same day. Immune reconstitution was considered in those whose T CD4+ count was below 200 cells/mm3, but these values increased above 200 cells/mm3 after the use of antiretrovirals. The odds ratio obtained by a 2x2 contingency table and a chi-square test were used to measure the association between categorical variables. Results The prevalence of thyroid disease was 34.18%; of these, 4.34% were positive for anti-TPO. There was an association of risk between stavudine use and subclinical hypothyroidism (OR = 4.19, 95% CI: 1.29 to 13.59, X2 = 6.37, p = 0.01). Immune reconstitution achieved protection associated with thyroid disease that was near statistical significance OR = 0.45, 95% CI: 0.19 to 1.04, X2 = 3.55, p = 0.059. Conclusion The prevalence of thyroid disease in the sample studied was higher than what had been found in the literature, with a low positive anti-TPO frequency. The historical use of stavudine has an association of risk for the presence of subclinical hypothyroidism, and immune reconstitution has trends towards protection for the presence of thyroid diseases. .

Seroprevalence and Potential Risk Factors Associated with Neospora spp. Infection among Asymptomatic Horses in Jordan

This study aimed to determine the seroprevalence and to identify risk factors associated with Neospora spp. infection in horses in Jordan. Management related data were collected from each farm and individual horses. Sera from 227 horses from 5 of 6 climatic regions in Jordan were analyzed for the presence of antibodies to Neospora spp. by ELISA kit. The study was performed during spring of 2010. The association between seropositivity and risk factors was analyzed. A total of 7 (3%) of 227 sera had antibodies for Neospora spp. There was a significant regional difference (P=0.018) between the 5 climatic regions. Positive cases were located in Amman and Irbid, while the other regions (Zarqa, Jordan Valley, and Wadi Mousa) had zero prevalence. The use of anthelmintics at least once a year resulted in a significant reduction of the seroprevalence to Neospora spp. (1.6% vs 9.8%). However, this might be a phenomenon by chance and a better hygiene since owners can invest in anthelmintics. Other risk factors such as age, gender, breed, usage, body condition score, grazing, presence of other animals mixed with the horses in the same property, and a history of previous diseases were not significantly associated with the seroprevalence to Neospora spp. infection. This is the first study to report on the presence of Neospora seropositive horses in Jordan. Further studies are warranted to better understand the role of certain risk factors in the transmission of Neospora spp. among horse population and to determine which Neospora spp. are responsible for the infection.

Prevalence of Atrial Fibrillation and Relation to Echocardiographic Parameters in a Healthy Asymptomatic Rural Korean Population

Atrial fibrillation (AF) is the most common arrhythmia worldwide and a potent independent risk factor for stroke. This study aimed to determine the prevalence of AF in a population-based sample of adults in a rural region of Korea. Between January 2005 and December 2009, 4,067 individuals (60.2 +/- 11.2 yr old, M: F = 1,582:2,485) over 21 who were residents of the county of Yangpyeong, Korea, participated in the study. AF was assessed on a resting 12-lead electrocardiogram (ECG) in 4,053 of the participants. Blood tests and transthoracic echocardiography (TTE) were also performed to investigate the relationship between left ventricular mass and AF in the study group. Fifty-four cases (32 men) were diagnosed as AF among the 4,053 subjects. The crude prevalence of AF was 1.3%. It was highest (2.3%) among sixty- and seventy- year olds, and higher in men than women in all age groups over 50. The prevalence in men was 2.0%, and in women 0.9%. In univariate analysis, age, male gender, body mass index, total serum cholesterol, alanine transaminase, serum creatinine, adiponectin level, and ischemic heart disease were associated with AF. Among the TTE parameters, systolic and diastolic left ventricular systolic internal dimension (LVID), and LV ejection fraction were associated with AF. In this relatively healthy population in a rural area of Korea, the prevalence of AF is 1.3%, and increases with age. Of the TTE parameters, systolic and diastolic LVID and left atrial diameter are related to prevalence of AF.

A Study on Pulmonary Complications of Systemic Sclerosis in Eastern India.

Aim. This study was undertaken to find out the characteristics of clinical, radiological and functional changes affecting the respiratory system in patients with systemic sclerosis (SSc) from eastern India, and the association of these characteristics with pulmonary hypertension. Methods. This was a cross-sectional, observational study involving 46 patients. Other than the routine tests, anti-nuclear antibody (ANA), spirometry, diffusing capacity of lung for carbon monoxide (DLCO) measurement, chest radiograph, highresolution computed tomography (HRCT) of thorax, 6-minute walk test and echocardiography were done. Results. Out of a total of 46 patients, 27 patients had diffuse cutaneous SSc (dcSSc) and 19 had limited cuteaneous SSc (lcSSc). Eleven patients had pulmonary hypertension. The HRCT revealed diffuse parenchymal lung disease (DPLD) in 32 (65%) cases. The ANA was positive in 83% cases. Anti-Scl70 was found in 41% of patients with dcSSc and anti-centromere antibody was found in 47% of patients with lcSSc. Spirometry revealed restrictive pattern in 30 patients; 9 had obstruction; and the rest were normal. The DLCO was abnormal in 38 patients. A strong correlation was found between reduction in DLCO and pulmonary artery systolic pressure (PASP). Also, a strong association was observed between a drop of >4% in oxygen saturation on 6-minute walk test and presence of pulmonary arterial hypertension (PAH). Conclusions. Majority of the patients with SSc had restrictive lung disease with abnormal DLCO and features resembling non-specific interstitial pneumonia. Nucleolar ANA was predominantly found in patients having PAH. Presence of DPLD had a negative association with presence of anti-centromere antibody. Reduction in DLCO and a fall of >4% in oxygen saturation on 6-minute walk test may be used as predictors of PAH in asymptomatic individuals.

Influenza A virus infection of healthy piglets in an abattoir in Brazil: animal-human interface and risk for interspecies transmission

Asymptomatic influenza virus infections in pigs are frequent and the lack of measures for controlling viral spread facilitates the circulation of different virus strains between pigs. The goal of this study was to demonstrate the circulation of influenza A virus strains among asymptomatic piglets in an abattoir in Brazil and discuss the potential public health impacts. Tracheal samples (n = 330) were collected from asymptomatic animals by a veterinarian that also performed visual lung tissue examinations. No slaughtered animals presented with any noticeable macroscopic signs of influenza infection following examination of lung tissues. Samples were then analysed by reverse transcription-polymerase chain reaction that resulted in the identification of 30 (9%) influenza A positive samples. The presence of asymptomatic pig infections suggested that these animals could facilitate virus dissemination and act as a source of infection for the herd, thereby enabling the emergence of influenza outbreaks associated with significant economic losses. Furthermore, the continuous exposure of the farm and abattoir workers to the virus increases the risk for interspecies transmission. Monitoring measures of swine influenza virus infections and vaccination and monitoring of employees for influenza infection should also be considered. In addition regulatory agencies should consider the public health ramifications regarding the potential zoonotic viral transmission between humans and pigs.

Prospective Observation of 5-Year Clinical Course of Subclinical Hypothyroidism in Korean Population

Subclinical hypothyroidism (SCH) is a common clinical condition, whereas it's natural course has not been identified distinctly. We evaluated the natural history of 169 SCH patients over 5-yr and the prognostic factors including thyroid autoantibodies and thyroid ultrasonographic (USG) findings related to develop overt hypothyroidism. After 5 yr, 47.3% of patients showed normalization of TSH, while 36.7% of patients remained persistence of high level of TSH, and overt hypothyroidism developed in 11.2% of patients. There were painless thyroiditis (2.9%) and hyperthyroidism (1.7%) during 5 yr follow-up. The thyroid nodule was seen in 48.6% of patients. Most of patients had 1 to 2 nodules whereas only 3% of patients with thyroid nodule had more than 6 nodules. Overt hypothyroidism patients had more heterogenous echogenecity in USG compared to patients with normalization or persistent SCH (76.5% vs 50.0% vs 35.0%, P = 0.048) and higher prevalence positive anti-thyroid peroxidase (anti-TPO Ab) and anti-thyroglobulin antibody (anti-Tg Ab) and titer of anti-TPO Ab than other two groups. The cut off values for prediction of overt hypothyroidism were TSH > 7.45 microIU/mL, free T4 560 IU/mL. SCH has various courses and initial TSH, free T4, presence of thyroid autoantibody, titer of thyroid autoantibody; and thyroid USG findings can serve as a prognostic factor for progression of overt hypothyroidism. These parameters suggest consideration to initiate thyroid hormone treatment in SCH.

Ultrasound detected asymptomatic cholelithiasis: an age-based protocol for management / Colelitiasis asintomática detectada por ultrasonido: un protocolo basado en la edad para el tratamiento

OBJECTIVE: This study was undertaken to examine the correlation between age and gender and the presence of ultrasound findings of acute or chronic cholecystitis in adult patients with cholelithiasis. METHOD: The demographic data of all patients diagnosed with cholelithiasis and cholecystitis on ultrasound between January 1, 2002 and December 31, 2006 were reviewed and statistically analysed. RESULTS: Five hundred adults, 373 females (74.6%) and 127 males (25.4%), were diagnosed with cholelithiasis during the five-year period. Ages ranged from 18 to 94 years with a median age of 47 years. The diagnosis of cholecystitis was equivocal in 11 patients. Of the remaining 489, 22.1% (108) were diagnosed as positive for cholecystitis by ultrasound, the remaining 77.9% (381) being negative. No association was found between gender and cholecysytitis in bivariate analysis, (χ² = 1.82, df =1, p = 0.177). A statistically significant relation was found between age group category and ultrasound-determined cholecystitis status (χ² = 32.58, df = 4, p < 0.001). Higher proportions of persons in the 20-39-year (40.9%) and 40-59-year (20.4%) age groups had cholecystitis on ultrasound examination compared to other age categories where corresponding rates were approximately 11% or less. CONCLUSION: Patients 60 years or older who were diagnosed with cholelithiasis on ultrasound examination were less likely to have cholecystitis than younger patients.

OBJETIVO: Este estudio fue emprendido para examinar la correlación entre edad y género, y los hallazgos en ultrasonidos de colecistitis aguda o crónica en pacientes adultos con colelitiasis. MÉTODO: Se revisaron y analizaron estadísticamente los datos demográficos de todos los pacientes diagnosticados con colelitiasis y colecistitis a partir de ultrasonidos realizados entre el enero 1 de 2002 y diciembre 31 de 2006. RESULTADOS: Quinientos adultos - 373 hembras (74.6%) y 127 varones (25.4%) - fueron diagnosticados con colelitiasis durante el periodo de cinco años. Las edades fluctuaron de 18 a 94 con una edad mediana de 47 años. El diagnóstico de colecistitis fue equívoco en 11 pacientes. De los restantes 489, 22.1% (108) fueron diagnosticados positivos a la colecistitis por ultrasonido, resultando los restantes 7.9% (381) negativos. No se halló ninguna asociación entre el género y la colecistitis en el análisis bivariado, (χ² = 1.82, df =1, p = 0.177). Se halló una relación estadísticamente significativa entre la categoría del grupo etario y la condición de colecistitis determinada por el ultrasonido (χ² = 32.58, df = 4, p < 0.001). Las proporciones más altas de personas en los grupos de edad de 20 - 39 años (40.9%) y 40 - 59 años (20.4%) tenían colecistitis al ser examinadas con ultrasonido, comparadas a otras categorías de edad en las que las tasas correspondientes fueron aproximadamente 11% o menos. CONCLUSIÓN: Los pacientes de 60 o más años de edad, a quienes se les diagnosticó colelitiasis en el examen de ultrasonido, presentaban menos probabilidad de tener colecistitis que los pacientes más jóvenes.

Coronariopatia assintomática em chagásicos com insuficiência cardíaca: prevalência e fatores de risco / Asymptomatic coronary artery disease in chagasic patients

FUNDAMENTO: A concomitância de doença arterial coronária assintomática em pacientes com cardiomiopatia chagásica em IC é controversa na literatura médica, pois ambas as doenças se mostram prevalentes em algumas regiões do Brasil. Objetivo: Determinar a prevalência da coronariopatia (lesões > 50 por cento) em uma população específica de pacientes com cardiomiopatia chagásica em IC classes funcionais III e IV, que não apresentavam eventos coronarianos prévios. OBJETIVO: Determinar a prevalência da coronariopatia (lesões > 50 por cento) em uma população específica de pacientes com cardiomiopatia chagásica em IC classes funcionais III e IV, que não apresentavam eventos coronarianos prévios. MÉTODOS: Realizou-se cineangiocoronariografia em 61 pacientes consecutivos, portadores de cardiomiopatia chagásica, em IC classes funcionais III e IV, para se excluir coronariopatia. Esses pacientes faziam parte do protocolo do Estudo de Terapia Celular em Cardiopatias, o qual exigia a realização de cineangiocoronariografia antes de se injetarem células-tronco. Os fatores de risco para aterosclerose também analisados nessa população foram: idade, hipertensão arterial, diabetes, dislipidemia, tabagismo e sobrepeso. RESULTADOS: Idade média 51,6 + 9,6 anos, 65,5 por cento (n = 40) homens. A prevalência de coronariopatia encontrada nessa população foi de 1,6 por cento (1). As prevalências dos fatores de risco foram: hipertensão arterial 18 por cento (11), tabagismo 59 por cento (36), diabetes 1,6 por cento (1) e dislipidemia 6,5 por cento (4). CONCLUSÃO: A prevalência da coronariopatia assintomática em pacientes com IC grave de etiologia chagásica é baixa e, entre os fatores de risco para doença coronária, o tabagismo foi o mais prevalente.

BACKGROUND: Concomitant asymptomatic coronary artery disease in patients with Chagas cardiomyopathy in heart failure is controversial in the medical literature, as both diseases are prevalent in some regions of Brazil. OBJECTIVE: To determine the prevalence of coronary artery disease (lesions > 50 percent) in a specific population of patients with Chagas cardiomyopathy in HF functional class III and IV, who had no previous coronary events. METHODS: Coronary angiography was performed in 61 consecutive patients with Chagasic cardiomyopathy, in heart failure functional class III and IV, to exclude coronary artery disease. These patients were part of the Cell Therapy Study in Heart Diseases protocol, which required the coronary angiography to be carried out before stem cells were injected. Risk factors for atherosclerosis also analyzed in this population were: age, arterial hypertension, diabetes, dyslipidemia, smoking and overweight. RESULTS: mean age was 51.6 + 9.6 years and 65.5 percent (n = 40) of them were males. The prevalence of coronary disease in this population was 1.6 percent (1). The prevalence of risk factors were: arterial hypertension 18 percent (11), smoking 59 percent (36), diabetes 1.6 percent (1) and dyslipidemia, 6.5 percent (4). CONCLUSION: The prevalence of asymptomatic coronary artery disease in patients with severe heart failure due to Chagas disease is low and among the risk factors for coronary heart disease, smoking was the most prevalent.