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Health sci. dis ; 24(1): 1-5, 2023. figures, tables
Article in French | AIM | ID: biblio-1411406


Introduction. Au Mali, le dépistage de certains virus tels que la dengue, Zika et la fièvre de la vallée du Rift n'est pas systématique au centre national de transfusion sanguine (CNTS). Le risque peut être considérable en raison de leurs courtes périodes de virémie asymptomatique dans la population dont l'incidence est variable et parfois extrêmement élevée. Cette étude avait pour objectif d'explorer la possibilité de transmission de certains arbovirus à travers le don de sang au CNTS de Bamako. Méthodes. Il s'agissait d'une étude transversale, de juillet 2019 à juin 2020 à Bamako. Au total deux cents (200) donneurs de sang du CNTS ont été inclus. Les examens ont été réalisés au Centre d'Infectiologie Charles Mérieux (CICM) de Bamako avec le dépistage du génome des virus responsables de la Dengue, de la fièvre de la Vallée du Rift, et du Zika à l'aide de la technique de la RT-PCR en temps réel. Le Test de Dépistage Rapide (TDR) a été utilisé pour la détection des anticorps IgG et IgM spécifiques de la Dengue. Résultats. Le sexe masculin représente 84% (168/200). Le TDR a détecté 4,5% (9/200) de Dengue IgG positifs et aucun cas de Dengue IgM positif. La technique de RT-PCR n'a détecté aucun des trois virus. Conclusion. Cette étude prouve que le risque de transmission de certains arbovirus à travers le don de sang existe, mais il semble être minime au CNTS de Bamako

Background. In Mali, screening for certain viruses such as dengue, Zika, and Rift Valley fever is not systematic at the national blood transfusion center (CNTS). The risk can be considerable due to their short periods of asymptomatic viremia in the population with variable and sometimes extremely high incidence. The objective of this study was to explore the possibility of transmission of certain arboviruses through blood donation at the CNTS of Bamako. Methods. This was a cross-sectional study, from July 2019 to June 2020 in Bamako. A total of two hundred (200) blood donors from the CNTS were included. The examinations were performed at the Centre d'Infectiologie Charles Mérieux (CICM) in Bamako with the screening of the genome of viruses responsible for Dengue, Rift Valley fever, and Zika using the real-time RT-PCR technique. The Rapid Screening Test (RST) was used for the detection of Dengue-specific IgG and IgM antibodies. Results. Male sex represented 84% (168/200). The RDT detected 4.5% (9/200) of IgG positive Dengue and no IgM positive Dengue cases. The RT-PCR technique did not detect any of the three viruses. Conclusion. This study proves that the risk of transmission of certain arboviruses through blood donation exists, but it seems to be minimal at the CNTS of Bamako.

Humans , Male , Female , Arboviruses , Rift Valley Fever , Blood Donors , Reverse Transcriptase Polymerase Chain Reaction , Dengue , Zika Virus , Polymerase Chain Reaction
Hematol., Transfus. Cell Ther. (Impr.) ; 44(3): 379-385, July-Sept. 2022. tab
Article in English | LILACS | ID: biblio-1405013


ABSTRACT Introduction: Thromboembolic events occur due to an imbalance in the hemostasis and some factors associated with this condition can be inherited. In order to evaluate the frequency of genotypes considered to be common hereditary risk factors for thrombophilia associated with venous thrombosis (g.1691G>A and g.20210G>A) and hyperhomocysteinemia (g.677C>T and g.1298A>C), samples from voluntary healthy blood donors at the Hospital de Clínicas de Porto Alegre were tested. Methods: We examined 325 blood samples from blood donors collected from October 2017 to July 2018. Blood was collected on filter paper and the DNA was extracted for single nucleotide polymorphisms (SNPs) analysis using the qualitative real time polymerase chain reaction. Results: The calculated frequencies of each genetic variant in heterozygosity were 4% for the FV gene (g.1691G> A), 4% for the F2 gene (g.20210G> A) and 42% and 39% for methylenetetrahydrofolate reductase (MTHFR), g.677C>T and g.1298A>C, respectively. Only the genetic variants of MTHFR were found in homozygosity, with frequencies of 14% and 6% (g.677C>T and g.1298A>C), respectively. Discussion: Altogether, these results describe the frequencies of genetic variants associated with venous thrombosis and hyperhomocysteinemia in the analyzed group and are important to enhance our current knowledge about the genetic profiles of Brazilian blood donors.

Humans , Blood Donors , Prothrombin , Thrombophilia , Factor V , Prevalence , Risk Factors , Venous Thrombosis , Hyperhomocysteinemia , Heredity , Methylenetetrahydrofolate Reductase (NADPH2)
Rev. Inst. Adolfo Lutz ; 81(Único): e37345, mar.1, 2022. tab, graf


The present study aims to correlate the sample-to-cutoff ratios (S/CO) distributions of reactive results for HTLV-1/2 antibodies with the detection of proviral DNA in a population of blood donor candidates. It was carried out a retrospective data search of 632 HTLV-1/2 reactive samples, submitted to confirmatory testing from January 2015 to December 2019. Serological screening was performed by chemiluminescent microparticle immunoassay Architect rHTLV-I/II, whereas confirmatory testing was performed by in-house real-time polymerase chain reaction method. 496 out of 632 samples (78%) had undetectable HTLV-1/2 proviral DNA and 136 (22%) had detectable proviral DNA. HTLV infection was not confirmed in any individual for whom the S/CO ratio value was <4, and proviral DNA detection rates gradually escalated as S/CO ratio values increased. The sensitivity and predictive positive value found for the Architect rHTLV-I/II was 100% and 22%, respectively. The receiver operating characteristic (ROC) curve analysis showed that the optimal S/CO ratio value for predicting the presence of HTLV-1/2 was 18.11. High S/CO ratios were more associated with the detection of proviral DNA. The S/CO ratio value <4 suggests excluding true HTLV infection and the risk of blood transmission (AU).

O estudo tem como objetivo correlacionar às distribuições das razões sample-to-cutoff (S/CO) de resultados reagentes para anticorpos HTLV-1/2 com a detecção de DNA proviral em uma população de candidatos à doação de sangue. Realizou-se uma busca retrospectiva de dados de 632 amostras reagentes para HTLV-1/2 submetidas à testagem confirmatória entre janeiro de 2015 a dezembro de 2019. A triagem sorológica foi realizada pelo imunoensaio quimioluminescente de micropartículas Architect rHTLV-I/II, enquanto o teste confirmatório foi realizado pelo método de PCR em tempo real in-house. 496 de 632 amostras (78%) apresentaram DNA proviral indetectável e 136 (22%) apresentaram DNA proviral detectável. A infecção por HTLV não foi confirmada em nenhum indivíduo com valor de S/CO <4 e as taxas de detecção de DNA proviral escalonaram gradualmente à medida que as razões S/CO aumentaram. A sensibilidade e valor preditivo positivo encontrados para o Architect rHTLV-I/II foram 100% e 22%, respectivamente. Utilizando análise de curva ROC, o valor de razão S/CO ideal para predizer a presença de DNA proviral foi de 18,11. Razões S/CO elevadas foram mais associadas à detecção de DNA proviral. Em suma, o valor de S/CO <4 sugere a exclusão de infecção por HTLV e o risco de transmissão pelo sangue (AU).

Blood Donors , Immunoassay , Human T-lymphotropic virus 1 , Human T-lymphotropic virus 2 , Real-Time Polymerase Chain Reaction , Infections
Hematol., Transfus. Cell Ther. (Impr.) ; 44(1): 17-25, Jan.-Mar. 2022. tab, graf
Article in English | LILACS | ID: biblio-1364898


Abstract Introduction With the outbreak of COVID-19 and its containment measures, blood centers faced a huge challenge in balancing blood demand and supply and devising a preparedness plan to withstand the uncertain situation. This study assesses the effect of the COVID-19 pandemic on blood transfusion services and discusses the appropriate mitigation strategies adopted. Methods We analyzed our center's blood transfusion services during the first half-period of the pandemic (Y3) and non-pandemic years 2018(Y1) and 2019(Y2) in two-quarters Q1 (pre-lockdown), from January to March and Q2 (post-lockdown), from April to June. The blood donation variables, the packed red blood cells (PRBCs) demand and the utilization pattern were compared between pandemic (Y3) and non-pandemic years (Y1 and Y2) in each quarter. The mitigation strategy adopted at every step of the transfusion service is highlighted. Results During post-lockdown (Q2) of the pandemic year (Y3), the blood donation was majorly by repeat donors (83%) from the in-house site (82.5%). Furthermore, the proportion of outdoor donation, deferral, blood collection, demand and issue demonstrated a significant drop of 50%, 32.6%, 33%, 31.8% and 32.3%, respectively, in comparison to Q2 of the non-pandemic years (Y1 and Y2), with a statistically significant difference for surgical and hemorrhagic indications (p < 0.05). Coping strategies, such as blood donor education and motivation using e-platforms emphasizing eligibility during the pandemic, staggering of donor in-flow, postponement of elective surgeries and donor and staff' COVID-19 safety assurance, were followed. Conclusion The timely adoption of coping strategies played a crucial role in the better handling of shortcomings at our center's blood transfusion services caused by the COVID-19 pandemic.

Blood Donors , Blood Safety , COVID-19 , Blood Banks , Blood Transfusion , Coronavirus , Pandemics
Hematol., Transfus. Cell Ther. (Impr.) ; 44(1): 1-6, Jan.-Mar. 2022. tab, graf
Article in English | LILACS | ID: biblio-1364895


Abstract Introduction As the Coronavirus Disease 2019 (COVID-19) pandemic unfolds around the world; answers related to the antibody response against the virus are necessary to develop treatment and prophylactic strategies. We attempted to understand part of the immune response of convalescent plasma donation candidates. Method We carried out a cross-sectional, observational, non-intervention study, testing 102 convalescent plasma donation candidates for antibodies against the virus, relating these data to the time interval between symptom onset and sample collection, age, disease severity, and gender. Results In our sample, the individuals who developed a greater antibody response were the ones who had a longer time interval between symptom onset and sample collection, the ones who had been hospitalized and the subjects above 35 years old. Moreover, 17 individuals did not present any reactive antibodies. Conclusion These results are important in that they raise questions about the role of the humoral response against the virus, as some individuals do not develop antibodies to fight it. In addition, they help develop recruitment strategies for convalescent plasma donors, who should be asymptomatic for at least 21 days and are possibly more likely to have reactive antibodies after 35 days without symptoms.

Humans , Male , Female , Adolescent , Adult , Middle Aged , Young Adult , Coronavirus Infections , COVID-19 Serological Testing , COVID-19 , Plasma , Blood Donors , SARS-CoV-2
Chinese Journal of Epidemiology ; (12): 440-444, 2022.
Article in Chinese | WPRIM | ID: wpr-935409


Long-term repeated regular blood donation may result in the loss and deficiency of iron. Epidemiological studies have indicated that blood donation frequency, demographical characteristics, and genetic factors are associated with iron deficiency. Our review summarizes the progress in research of etiology of iron deficiency in blood donors and intervention measures to provide evidence for the health management of non-remunerated blood donors in China.

Blood Donors , Ferritins , Humans , Iron , Iron Deficiencies , Risk Factors
Article in Chinese | WPRIM | ID: wpr-939705


OBJECTIVE@#To analyze the molecular polymorphisms of CD36 among 58 blood donors with CD36 deficiency and compare with CD36 positive controls.@*METHODS@#A total of 58 donors with CD36 deficiency during a screening conducted in the laboratory from September 2019 to December 2020 were enrolled as the test group, including 39 males and 19 females, while 120 platelet donors with CD36 positive were randomly selected as the controls, including 76 males and 44 females. All of the subjects were Han nationality. The PCR-SBT method was used to detect coding region of CD36 gene, and molecular mutations were compared with those CD36 positive controls.@*RESULTS@#Among the 58 donors with CD36 deficiency, mutations appears in 32 individuals. The detection rate for type I was 71.43% (5/7), and type II was 51.92% (27/52), while among the 120 controls, mutations appears in 12 donors (10%). In the CD36 antigen-deficient donors, 16 variations were found, in which 329-330 del AC with the highest frequency accounted for 20.69%, followed by 1228-1239 del ATTGTGCCTATT(15.52%) and 1156 C>T(10.34%). Two variations, 198-205 del GATCTTTG and 220 C>T, led to premature termination of translation; four mutations, 329-330 del AC, 560 ins T, 1011-1049 39bp dupl and 1343-1344 ins TCTT, caused translation frame shift; 1228-1239 del ATTGTGCCTATT led to deletion of four amino acids (Ile-Val-Pro-Ile) at sites 410-413 of the peptide chain. The 1140 T>A and 1275 G>A were synonymous mutations, and the other 7 mutations resulted in the substitution of single nucleotide. The platelet expression in the donors of CD36 positive with 329-330 del AC or 1228-1239 del ATTGTGCCTATT mutation (heterozygote) was lower than those CD36 positive individuals without mutations (homozygote).@*CONCLUSION@#Multiple gene mutations in the CD36 coding region may cause CD36 deficiency, and the heterozygous individuals with mutations may lead to CD36 antigen reduction or deletion. Mutation is not detected in 44.83% of CD36 deficient individuals, there may be some other reasons for the CD36 antigen deficiency.

Blood Donors , Blood Platelet Disorders/metabolism , Blood Platelets/metabolism , CD36 Antigens/metabolism , Female , Genetic Diseases, Inborn , Humans , Male
Article in Chinese | WPRIM | ID: wpr-928704


OBJECTIVE@#To evaluate the risk of reentry in HBV reactive blood donors and feasibility of HBV reentry strategy.@*METHODS@#HBsAg+ or HBV DNA+ donors who had been quarantined for more than 6 months in Jiangsu Province could propose for reentry application. Blood samples were routinely screened by dual-ELISA for HBsAg, anti-HCV, HIV Ab/Ag, and anti- Treponema pallidum and those non-reactive ones were tested by minipool nucleic acid testing (NAT) for three times. To identify occult HBV donors, samples of NAT non-reactive were further tested by electrochemiluminescence immunoassay (ECLIA) for HBV seromarkers (including HBsAg, HBsAb, HBeAg, HBeAb, and HBcAb). Donors of only 4 ECLIA patterns were accepted to reentry, including all 5 HBV seromarkers negative, anti-HBs only but having history of hepatitis B vaccine injection, HBcAb only, HBsAb+ / HBcAb+ with HBsAb more than 200 IU/L. Additionally, the detection rate of HBV infection was compared between routine screening mode and ECLIA, as well as the reentry qualified rate of HBsAg+ and HBV DNA+ blood donors.@*RESULTS@#From Oct. 2016 to Aug. 2019, a total of 737 HBV reactive donors had applied for reentry, including 667 HBsAg+ reactive and 70 HBV DNA+ reactive donors. Among 3 screening methods, the highest HBV detection rate (43.15%, 318/737) was observed on ECLIA, while only 4.75% (35/737) on ELISA and 3.12% (23/737) on NAT, respectively. Among 4 qualified patterns of HBV serological markers, the highest proportion was found in the all negative group (22.90%, 155/677), followed by the group with HBsAb+ only and history of hepatitis B vaccine injection (19.35%, 131/677), and the median concentration of HBsAb was 237.7 IU/L. The unqualified rate of HBV DNA+ donors was 82.86%, which was significantly higher than 47.98% of HBsAg+ donors.@*CONCLUSION@#Routine screening tests merely based on ELISA and NAT could miss occult HBV donors and may not be sufficient for blood safety. HBsAb concentration and vaccine injection history should be included in the evaluation of HBV reactive donors who intend to apply for reentry. There is a relatively larger residual risk of occult HBV infection in blood donors quarantined for HBV DNA reactive.

Blood Donors , DNA, Viral , Hepatitis B , Hepatitis B Surface Antigens , Hepatitis B virus/genetics , Humans
Niger. j. clin. pract. (Online) ; 25(6): 786-793, 2022. figures, tables
Article in English | AIM | ID: biblio-1373611


Background: The coronavirus disease 2019 (COVID-19) pandemic affected blood supplies globally. Mobile blood drive campaigns halted, and voluntary blood donations reduced, challenging available blood supplies. Furthermore, fears of virus transmission led to deferrals of elective surgeries and non-urgent clinical procedures with noticeable declines in blood donations and transfusions. Aims: We aimed to assess the effect of the COVID-19 pandemic on the number of blood donations and transfusions across the country by blood product type across various hospital departments. Materials and Methods: A retrospective descriptive study was conducted to determine the impact of the COVID-19 pandemic on blood services in 34 tertiary hospitals in Nigeria, comparing January to July 2019 (pre-COVID-19) to January to July 2020 (peri-COVID-19). Data were collected from the country's web-based software District Health Information System, Version 2 (DHIS2). Results: A 17.1% decline in numbers of blood donations was observed over the study period, especially in April 2020 (44.3%), a 21.7% decline in numbers of blood transfusions, especially in April 2020 (44.3%). The largest declines in transfusion were noted in surgery department for fresh frozen plasma (80.1%) [p = 0.012] and accident and emergency department transfusion of platelets (78.3%) [p = 0.005]. The least decline of statistical significance was observed in internal medicine transfusions of whole blood (19.6%) [p = 0.011]. Conclusions: The COVID-19 pandemic significantly affected the numbers of blood donations and transfusions in Nigeria. Strengthening blood services to provide various blood components and secure safe blood supplies during public health emergencies is therefore critical.

Blood Donors , Blood Transfusion , Blood Specimen Collection , Long Term Adverse Effects , COVID-19
Sudan j. med. sci ; 17(3): 387-397, 2022. tales, figures
Article in English | AIM | ID: biblio-1398379


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).

Blood , Blood Donors , Immunoglobulin M , Polymerase Chain Reaction , Risk Factors
Ann. afr. méd. (En ligne) ; 15(4): 1-8, 2022. tables
Article in French | AIM | ID: biblio-1398514


Contexte & objectif. L'hépatite virale B (HVB) par son évolution peut déboucher vers la guérison ou vers une forme chronique qui est très peu documentée chez les donneurs bénévoles de sang (DBS). L'objectif de la présente étude était de déterminer la prévalence de l'HVB chronique. Méthodes. L'étude réalisée au Centre National de Transfusion Sanguine de Bangui était rétrospective et portait sur les données de contrôle sérologique des DBS de Bimbo et de Bangui, capitale de la République centrafricaine (RCA). L'échantillonnage exhaustif concerne la période de juillet 2013 à décembre 2019. Le DBS est porteur d'une infection chronique si l'antigène de surface de l'HVB persiste pendant plus de six mois. Le test de Chi carré de Pearson au seuil de 5 % et l'odd ratio (OR) ont été utilisés comme test d'association. Résultats. Les données de contrôle sérologique de 702 DBS âgés de 18 à 62 ans ont été analysées. Le sexe masculin était prépondérant (n=598). La prévalence de l'HVB chronique était de 70,5 %. Cette prévalence était plus élevée chez les DBS de 25 à 34 ans (30,4 %), les hommes (58,8 %) et les DBS qui résident à Bangui (61,2 %). La forme chronique était significativement associée au jeune âge (18 à 44 ans) et au sexe masculin (p< 0,05). La coïnfection par le VIH et l'hépatite C était retrouvée dans 5,5 % des cas (39/702). Conclusion. La prévalence de l'HVB chronique est très élevée chez les DBS de Bangui et Bimbo. La forme chronique était significativement associée à l'âge et au sexe. La gratuité de la charge virale et du traitement antiviral sont des perspectives à mettre en œuvre

Context and objective. Viral hepatitis B (VHB) by its evolution can lead to recovery or to a chronic form. This chronic form, a source of new contaminations, is not documented among voluntary blood donors (VBD) in Bangui and Bimbo. The present study aimed to determine the prevalence of chronic VHB among VBD in the two cities in the Central African Republic (CAR). Methods. The study carried out at the Bangui National Blood Transfusion Center was retrospective and focused on serological control data from VBD from Bangui, capital of CAR and Bimbo. The exhaustive sampling is from July 2013 to December 2019. A VBD carries a chronic infection if the VHB surface antigen persists for more than six months. Results. Serological control data from 702 VBD aged 18 to 62 years were analyzed. Male sex predominated at inclusion (n = 598). The prevalence of chronic VHB was 70.5 %. This prevalence was higher among young VBD aged 25 to 34 years (30.4 %), the male gender (58.4 %) and VBD residing in Bangui (61.2 %). The chronic form was significantly associated with young age (18 to 44 years) and male sex (p< 5%). Co-infection with HIV and hepatitis C was found in 5.5 % of cases (39/702). Conclusion. The prevalence of chronic VHB is very high in VBD from Bangui and Bimbo. The chronic form was significantly associated with age and sex. Free viral load and antiviral treatment are prospects to be implemented.

Humans , Male , Female , Adolescent , Adult , Middle Aged , Blood Donors , HIV Infections , Hepatitis B, Chronic , Hepatitis B , Coinfection
Clin. biomed. res ; 42(1): 39-43, 2022.
Article in Portuguese | LILACS | ID: biblio-1391248


Introdução: A hemoterapia é uma prática terapêutica pelo meio de transfusão sanguínea. Devido ao baixo estoque de bolsas de sangue e o aumento de pacientes crônicos e emergenciais, se faz necessária a realização de testes imuno-hematológicos para minimizar os riscos de reações transfusionais e aloimunizações em doadores e receptores de sangue. Deste modo, no estudo foi avaliada a prevalência dos antígenos dos sistemas Rh e Kell em doadores de sangue de Porto Alegre ­ RS.Métodos: Estudo quantitativo, transversal e retrospectivo que foi realizado através da análise das informações dos doadores de sangue contidas no banco de dados do Hemocentro do Estado do Rio Grande do Sul, nos anos de 2018 e 2019.Resultados: Das 6.479 amostras fenotipadas, quanto ao sistema Rh, 44,6% são Rh positivo e 55,4% são Rh negativo. As frequências dos antígenos encontradas foram de, CC 10,1%, Cc 27%, cc 62,9%, EE 1,2%, Ee 13,9%, ee 84,9%. E, para o sistema Kell, K1 positivo 7,1% e K1 negativo 92,9%.Conclusões: Antígenos do sistema Rh e Kell exibem um grande nível de imunogenicidade e uma forte ligação com a Doença Hemolítica do Recém-nascido, podendo ocorrer a sensibilização em pacientes caso não haja a compatibilidade sanguínea. Este estudo ressalta a importância da implementação da fenotipagem eritrocitária em doadores de sangue, sugere-se mais estudos com períodos distintos para a pesquisa de resultados satisfatórios.

Introduction: Hemotherapy is a therapeutic practice consisting of blood transfusion. Low blood supply and an increase in chronic and emergency patients have made it necessary to conduct immunohematology tests to minimize the risks of adverse reactions and alloimmunization in donors and recipients. Therefore, this study aimed to assess the prevalence of Rh and Kell blood group antigens among blood donors in Porto Alegre, Rio Grande do Sul, Brazil.Methods: We conducted a quantitative, cross-sectional, retrospective study. Information from blood donors included in the Rio Grande do Sul's Blood Center database from 2018 to 2019 were analyzed.Results: A total of 6,479 samples were phenotyped, of which 44.6% were Rh-positive and 55.4% were Rh-negative. Antigen prevalence was CC (10.1%), Cc (27%), cc (62.9%), EE (1.2%), Ee (13.9%), and ee (84.9%). As for the Kell group, 7.1% were K1-positive and 92.9% were K1-negative.Conclusions: The Rh and Kell antigens are highly immunogenic and have a strong link with the hemolytic disease of the newborn. Sensitization may occur in patients if there is no blood compatibility. This study highlights the importance of implementing erythrocyte phenotyping in blood donors. Further studies should be conducted in different time frames to achieve satisfactory results.

Humans , Rh-Hr Blood-Group System/blood , Blood Donors/statistics & numerical data , Transfusion Reaction/blood , Kell Blood-Group System/blood , Blood Transfusion , Retrospective Studies , Hemotherapy Service
Rev. méd. Minas Gerais ; 32: 32102, 2022.
Article in English, Portuguese | LILACS | ID: biblio-1372831


Introdução: Apesar do traço falciforme ser considerado uma condição benigna, existem estudos mostrando que apresenta manifestações clínicas relevantes, o que torna importante a realização de estudos para conhecer sua prevalência. Objetivo: Estimar a prevalência de traço falciforme em doadores de sangue da região Centro-Oeste do estado de Minas Gerais (MG). Metodologia: As informações sobre a presença de HbS no sangue, etnia, gênero, escolaridade, idade, níveis de hemoglobina e procedência dos doadores de sangue foram consultadas no sistema Hemote Plus da Fundação Hemominas (FH). Resultados: A média de idade dos doadores de sangue da região Centro-Oeste de MG foi de 34,4±11,3 anos, 51,4% eram do sexo masculino, 52,8% se autodeclararam brancos, 53,3% possuíam até 2º grau completo e a média dos níveis de hemoglobina foi de 15,1±1,3 g/dL. A prevalência de traço falciforme foi de 2,2% nessa população. Entre os doadores portadores do traço falciforme houve maior frequência de autodeclarados pardos, seguidos de autodeclarados brancos (30,7%) e autodeclarados negros (26,5%), as faixas etárias de 21 a 30 anos (31,9%) e de 31 a 40 anos (30,7%) e o sexo feminino (53,9%) foram mais prevalentes e a média dos níveis de hemoglobina foi de 14,8±1,3 g/dL. Conclusão: A prevalência de traço falciforme encontrada em nosso estudo foi de 2,2%, o que se assemelha à encontrada na população brasileira e é discretamente menor que a do Estado de MG. Esses achados contribuem com os demais estudos de prevalência no Brasil.

Introduction: Although sickle cell trait is considered a benign condition, there are studies showing that it presents relevant clinical manifestations, which makes it important to carry out studies to know its prevalence. Objective: To estimate the prevalence of sickle cell trait in blood donors in the Midwest region of the state of Minas Gerais (MG). Methods: Information on the presence of HbS in the blood, ethnicity, gender, education, age, hemoglobin levels and origin of blood donors were consulted in the Hemote Plus system of the Hemominas Foundation (FH). Results: The mean age of blood donors in the Midwest region of MG was 34.4±11.3 years, 51.4% were male, 52.8% self-declared white, 53.3% had up to high school and the mean hemoglobin levels were 15.1±1.3g/dL. The prevalence of sickle cell trait was 2.2% in this population. Among the donors with sickle cell trait, there was a higher frequency of self-declared brown, followed by self-declared white (30.7%) and self-declared black (26.5%), aged 21 to 30 years (31.9%) and 31 to 40 years (30.7%) and females (53.9%) were more prevalent and the mean hemoglobin levels were 14.8±1.3 g/dL. Conclusion: The prevalence of sickle cell trait found in our study was 2.2%, which is similar to that found in the Brazilian population and is slightly lower than in the state of MG. These findings contribute to other prevalence studies in Brazil.

Humans , Adult , Sickle Cell Trait , Blood Donors , Prevalence
Med.lab ; 26(4): 353-364, 2022. Grafs, Tabs
Article in Spanish | LILACS | ID: biblio-1412446


Introducción. La seguridad transfusional es el objetivo primordial de los bancos de sangre, sin embargo, conlleva un alto riesgo de eventos adversos como son las infecciones transmisibles por transfusión (ITT). El conocimiento de la prevalencia de estas infecciones fue de particular interés en esta investigación, donde se determinó su frecuencia, coinfección y relación con el tipo de donantes admitidos. Metodología. Estudio observacional retrospectivo de 2017 y 2018, en el que se incluyeron todos los registros de donantes de sangre que contenían datos demográficos y resultados de los marcadores obligatorios en el país (Ecuador), tanto de pruebas serológicas como moleculares. Se obtuvo el permiso del custodio de la información y del subcomité de bioética de investigaciones en seres humanos. Para el análisis de los datos se utilizó estadística descriptiva e inferencial. Resultados. Se determinó una prevalencia del 3,18 % de resultados reactivos para una o más ITT, el rango de edad más prevalente fue de 29 a 40 años, el 89,8 % fueron donantes compensatorios, y de ellos el 90 % fueron reactivos para una o más ITT. El marcador serológico más prevalente fue el anti-core del virus de la hepatitis B (anti-HBc), seguido por el de sífilis y los anticuerpos contra el virus de la hepatitis C (VHC). La coinfección más prevalente fue con sífilis y hepatitis B. Se encontró una diferencia estadísticamente significativa entre los resultados obtenidos en las pruebas serológicas y las moleculares (x2=26,9; p=0,000). Conclusión. Las ITT en los bancos de sangre son un riesgo latente, por lo que es necesario conocer las variaciones epidemiológicas que existen en cada población. El conocimiento de la prevalencia de las ITT en donantes de sangre permite establecer nuevas estrategias de selección del donante, que garanticen la mejor seguridad posible en las transfusiones, además debe verificarse siempre la metodología utilizada y hacer monitoreo permanente del sistema de calidad establecido

Introduction. Transfusion safety is the primary objective of blood banks, however one of the adverse reactions to blood transfusion are the transfusion transmissible infections (TTIs). Knowledge of the prevalence of these infections was of particular interest in this study where we determined their frequency, co-infection and relationship with the type of donors admitted. Methodology. Retrospective observational study during 2017 and 2018, in which all blood donor records containing demographic data and results of the country's (Ecuador) mandatory serological markers of both serological and molecular tests were included. Permission was obtained from the data custodian and the Human Research Bioethics Subcommittee. Descriptive and inferential statistics were used for data analysis. Results. A prevalence of 3,18% of reactive results to one or more TTIs was determined, the most prevalent age range was 29 to 40 years, 89.8% were compensatory donors and 90% of them were reactive to one or more TTIs. The anti- core serological marker of the hepatitis B virus (anti-HBc) was the most prevalent, followed by syphilis and hepatitis C antibodies. Syphilis and hepatitis B were identified as the most prevalent coinfection. The correlation between the results obtained in the serological and molecular tests was determined to be different and statistically significant (x2=26.9; p=0.000). Conclusion. TTIs in blood banks are a latent risk, so it is necessary to know the epidemiological variations that exist in every population. Knowledge of the prevalence of TTIs in blood donors facilitates new donor selection strategies that guarantee the best possible safety in transfusions. In addition, the methodology used must always be verified and the established quality system must be permanently monitored

Blood Donors , Blood Transfusion , Seroepidemiologic Studies , Communicable Diseases
Rev. baiana saúde pública ; 45(3): 145-160, 20213112.
Article in Portuguese | LILACS | ID: biblio-1393101


A transfusão de sangue é um procedimento comum nos serviços de saúde, embora não seja isento de riscos. O descarte sorológico e a análise do perfil do doador fornecem informações essenciais para a segurança da transfusão. Este artigo avalia a prevalência e a tendência de descarte das bolsas de sangue por positividade sorológica para doenças transmissíveis por transfusão do hemocentro de Sergipe. Trata-se de um estudo observacional, relativo às doações realizadas entre janeiro de 2007 e dezembro de 2018. Das 308.953 doações, 16.828 (5,45%) foram descartadas devido à positividade em alguma sorologia de triagem. Verificou-se uma tendência de diminuição do descarte de bolsas de sangue nas sorologias testadas. As sorologias responsáveis pelo descarte foram: anti-HBc (2,09%), sífilis (1,49%), anti-HIV (0,82%), HBsAg (0,62%), anti-HCV (0,52%), anti-HTLV-1/2 (0,23%) e Chagas (0,15%). Com relação ao perfil do doador, houve maior descarte de doadores homens, de reposição e de faixas etárias avançadas. Neste estudo foi encontrada uma alta prevalência de descarte, embora com tendência decrescente para todas as sorologias, exceto sífilis, que permaneceu estacionária no período. Os resultados reforçam a necessidade dos processos de triagem sorológica para garantir a segurança transfusional, tendo em vista que essas doenças ainda são frequentes na população. Evidencia-se a importância da realização de campanhas educativas, de testagem e tratamento para as principais infecções de risco transfusional para que diminua a taxa de descarte de bolsas de sangue e melhore a qualidade transfusional.

Although a common health care procedure, blood transfusion is not risk-free. Serological disposal and donor profile analysis provide key information for transfusion safety. This study evaluates the prevalence and tendency of discarding blood bags due to serological positivity for transfusion-transmitted diseases at a blood center in Sergipe, Brazil. An observational study was conducted on donations made between January 2007 and December 2018. Of the 308,953 donations received, 16,828 (5.45%) were discarded due to positive screening serology, with a decrease trend in discard for the serologies tested. Anti-HBc (2.09%), syphilis (1.49%), anti-HIV (0.82%), HBsAg (0.62%), anti-HCV (0.52 %), anti-HTLV-1/2 (0.23%) and Chagas (0.15%) were the serologies responsible for disposal. As for donor profile, greater discard was observed for men, replacement and advanced age donors. Results showed a high prevalence of discard, but with a decreasing trend for all serologies excepting syphilis, which remained stationary in the period. They reinforce the importance of serological screening processes for ensuring transfusion safety, as these diseases are still common among the population. Carrying out educational, testing and treatment campaigns for the main transfusion risk infections is essential to reduce blood bag disposal rate and improve transfusion quality.

La transfusión de sangre es un procedimiento común en los servicios de salud, aunque no está libre de riesgos. La eliminación serológica y el análisis del perfil del donante proporcionan información esencial para la seguridad de las transfusiones. Este estudio tiene como objetivo evaluar la prevalencia y tendencia del descarte de bolsas de sangre por positividad serológica para enfermedades transmisibles por transfusión en el hemocentro de Sergipe (Brasil). Se trata de un estudio observacional, relacionado con las donaciones realizadas entre enero de 2007 y diciembre de 2018. De las 308.953 donaciones, 16.828 (5,45%) se descartaron por positividad en alguna serología de cribado. Hubo una tendencia a disminuir el descarte de bolsas de sangre en las serologías probadas. Las serologías responsables de la eliminación fueron: anti-HBc (2,09%), sífilis (1,49%), anti-VIH (0,82%), HBsAg (0,62%), anti-HCV (0,52%), anti-HTLV-1/2 (0,23%) y Chagas (0,15%). En cuanto al perfil del donante, hubo un mayor descarte en los donantes masculinos, de reemplazo y en edad avanzada. En el estudio se constató una alta prevalencia de descarte, aunque con tendencia decreciente para todas las serologías, excepto para sífilis, que se mantuvo estacionaria en el período. Los resultados refuerzan la necesidad de procesos de cribado serológico para garantizar la seguridad transfusional, dado que estas enfermedades aún son comunes en la población. Se resalta la importancia de realizar campañas de educación, testeo y tratamiento de las principales infecciones de riesgo transfusional para reducir la tasa de eliminación de bolsas de sangre y mejorar la calidad transfusional.

Blood Donors , Blood Transfusion , Seroepidemiologic Studies , Communicable Diseases , Prevalence , Triage , Hemotherapy Service
Hematol., Transfus. Cell Ther. (Impr.) ; 43(4): 410-416, Oct.-Dec. 2021. tab
Article in English | LILACS | ID: biblio-1350825


ABSTRACT Background: The screening of Trypanosoma cruzi-infected blood donors using two serological techniques frequently leads to conflicting results. This fact prompted us to evaluate the diagnostic performance of four "in-house" immunodiagnostic tests and two commercially available enzyme-linked immunosorbent assays (ELISAs). Material and Methods: One hundred and seventy-nine blood donors, whose screening for Chagas disease was doubtful, underwent three in-house ELISAs, one in-house immunoblotting test (TESA-blot), and two commercial ELISAs (bioMérieux and Wiener) in an attempt to define the presence or absence of infection. Simultaneously, 29 donors with previous positive results from three conventional serological tests and 30 donors with constant negative results were evaluated. Results: The ELISA-Wiener showed the highest rate in sensitivity (98.92%) and the ELISA-bioMérieux, the highest specificity (99.45%), followed by the TESA-blot, which showed superior performance, with lower false-negative (2.18%) and false-positive (1.12%) rates. In series, the combination composed of the TESA-blot and ELISA-bioMérieux showed slightly superior performance, with trifunctional protein deficiency (TFP) = 0.01%. Conclusion: Our study confirms the high sensitivity and specificity of commercial kits. To confirm the presence or absence of T. cruzi infection, the combination of TESA-blot and ELISA-bioMérieux may be suggested as the best alternative. Individually, the TESA-blot performed the closest to the gold standard; however, it is not commercially available.

Humans , Trypanosoma cruzi , Immunologic Tests , Chagas Disease , Blood Donors , Enzyme-Linked Immunosorbent Assay , Immunoblotting
Hematol., Transfus. Cell Ther. (Impr.) ; 43(3): 229-235, July-Sept. 2021. tab, graf
Article in English | LILACS | ID: biblio-1346268


ABSTRACT Introduction: As coronavirus disease-2019 (COVID-19) spread worldwide and social restrictions were intensified, difficulties in blood supply were expected to result in a shortage of blood donors, logistic issues and a change in blood consumption. Consequences could be detrimental to the meeting of the blood supply demand, especially in a decentralized blood bank in the State of São Paulo responsible for providing blood to more than 100 hospitals, mostly of the public health system. Aiming to minimize negative effects and focusing on maintenance of the blood supply, a different approach was discussed and adopted. Materials and methods: Briefly, strategies were related to monitoring and promoting measures to achieve a positive RBC unit balance. Thus, the number of donors, transfusions, RBC unit inventory, RBC unit loss and RBC units within up to 5 days from the expiration date were evaluated. Results: Several strategies were adopted to ensure sufficient availability of RBC units: blood donation was improved with social media and extra blood collections, a restrictive transfusion protocol was implemented, a new logistic process to use RBC units closer to the expiration date was established and non-isogroup transfusions were avoided. Conclusion: Altogether, described strategies were crucial to optimize blood storage during the pandemic. Investing in monitoring and logistics contributed to a positive RBC unit balance and conserving these strategies could be useful.

Blood Banks , Blood Donors , Erythrocytes , Pandemics , SARS-CoV-2 , COVID-19
Hematol., Transfus. Cell Ther. (Impr.) ; 43(3): 236-242, July-Sept. 2021. tab, graf
Article in English | LILACS | ID: biblio-1346261


ABSTRACT Background: The level of satisfaction of donors with the blood donation system is an important factor which influences their intent to return for future donation. A 25-item questionnaire on the satisfaction of blood donors has been recently proposed to assess the donor satisfaction with the service provided by a blood bank. The objective of this study was to present a proposal for application and interpretation of a BDSQ considering a sample of blood donors of a Brazilian blood bank. Methods: A sample of 1019 blood donors at the Regional Hemotherapy Center of Franca, Brazil, answered the BDSQ. A top-box analysis was used to assess the associations between the variables characterizing the profiles of blood donors and their overall satisfaction with the service provided by the blood bank. We proposed the use of a performance-importance plot (PIP) for the interpretation of the 25 items of the BDSQ. Results: Older donors are more likely to report lower overall satisfaction with the service provided by the blood bank. PIP allows us to classify the items of BDSQ into longand short-term improvement opportunities as well as into motivational and hygiene factors. Motivational factors (i.e. attributes that promote overall satisfaction when present) tend to be associated with the treatment offered by the blood bank staff. Donors seem to give more importance to the interpersonal aspects than to the physical structure of the service and other aspects of convenience. Conclusions: Top-box analysis and PIP proved to be efficient strategies to interpret the results of the BDSQ.

Humans , Male , Female , Adolescent , Adult , Middle Aged , Personal Satisfaction , Blood Donors , Surveys and Questionnaires
Hematol., Transfus. Cell Ther. (Impr.) ; 43(3): 256-262, July-Sept. 2021. tab
Article in English | LILACS | ID: biblio-1346251


The under-representation of women in blood donation can lead to blood shortages. We aimed to determine the factors, which encourage or impede blood donations in women. The findings can help us in designing effective recruitment strategies that could encourage women to donate blood to cover the patients' needs. This cross-sectional study was conducted in Shiraz, Iran, from the 1st of January 2017 to the 1st of August 2017 on women aged 18-60 years old. The demographic characteristics of the participants, the reasons that motivate blood donors and the factors that discourage non-donors were surveyed. Reasons for lapses in donors were also mentioned. The most frequent reasons for blood donation were altruistic causes (94.4%), moral and personal obligations (89.1%), the feeling of responsibility (82.7%), and awareness of the positive effects on their health (77.4%). The most common deterrents in non-donors were fear of developing anemia (68.4%) or weakness and dizziness (66%), unsuitability due to certain medical conditions (62.4%), and lack of a situation in which they were asked to donate blood (61.8%). Although altruistic reasons are the chief motivating factors for women to donate blood, the overall female contribution in blood donation remains low. Therefore, it is necessary to take measures aiming at informing women about the importance of blood donation and to reduce fears based on misinformation. Confidence in the blood donation organization must be a major consideration in future recruitment strategies to reassure women about the safety of blood donation.

Humans , Female , Adolescent , Adult , Middle Aged , Blood Donors , Iran , Motivation