Abstract INTRODUCTION: Tuberculosis (TB) is the leading cause of death worldwide caused by a single infectious disease agent. Brazil, Russia, India, China, and South Africa (BRICS) account for more than half of the world’s TB cases. Bacillus Calmette-Guérin (BCG) remains the only vaccine available despite its variable efficacy. Promising antigen-based vaccines have been proposed as prophylactic and/or immunotherapeutic approaches to boost BCG vaccination. Relevant antigens must interact with the range of human leukocyte antigen (HLA) molecules present in target populations; yet this information is currently not available. METHODS: MEDLINE and EMBASE were systematically searched for articles published during 2013-2020 to measure the allelic frequencies of HLA-DRB1 in the BRICS. RESULTS: In total, 67 articles involving 3,207,861 healthy individuals were included in the meta-analysis. HLA-DRB1 alleles *03, *04, *07, *11, *13, and *15 were consistently identified at high frequencies across the BRICS, with a combined estimated frequency varying from 52% to 80%. HLA-DRB1 alleles *01, *08, *09, *10, *12, and *14 were found to be relevant in only one or two BRICS populations. CONCLUSIONS: By combining these alleles, it is possible to ensure at least 80% coverage throughout the BRICS populations.

Abstract INTRODUCTION: Bacille Calmette-Guérin (BCG) downmodulates allergen-specific IgE levels and prevents other atopic responses in experimental models but fails to protect against respiratory allergies. Human responsiveness to BCG is variable and may interfere with protection. METHODS: Multivariate models were evaluated to test the possible effect of responsiveness (assessed by IFN-γ production) to BCG revaccination on the modulation of total and allergen-specific serum IgE levels in healthy volunteers participating in a randomized controlled trial. RESULTS: Serum total or Derp-specific IgE levels did not change regardless of the increase in IFN-γ levels. CONCLUSIONS: BCG responsiveness does not affect protection against atopy.

Resumo Introdução: Tornar-se médico é um processo bastante complexo. Fatores relacionados a personalidade do aluno, processo educacional e experiência diária com dor e morte contribuem para vivências psicoemocionais peculiares, nem sempre devidamente investigadas durante a formação médica. Objetivo: Estimar a prevalência de transtornos mentais comuns (TMC) e fatores associados durante os seis anos de graduação entre todos os estudantes de uma turma de medicina de uma universidade pública brasileira. Método: Estudo transversal por inquéritos repetidos. Todos os 40 alunos admitidos em 2006 na escola médica pesquisada foram incluídos no estudo e avaliados anualmente até 2011 através do SRQ-20 e de um questionário estruturado elaborado pelos autores sobre aspectos sócio-demográficos, pessoais e educacionais. Realizadas regressão logística e análise de correspondência. Resultados: Os 40 calouros na primeira avaliação tinham média de idade de 20 anos (DP=2,4), sendo 57,5% do sexo feminino e 41% aprovados no terceiro vestibular. A prevalência TMC aumentou ao longo do curso: de 12,5% no primeiro ano para 43,2% no quinto. As seguintes variáveis foram potencialmente associadas à TMC no quinto ano: sexo feminino (RP=1,38), originários de capitais (RP=1,97), achar o curso menos do que esperava (RP=3,20), ter desconforto com as atividades do curso (RP=2,10), estar insatisfeito com estratégias de ensino (RP=1,38) e sentir que o curso não é fonte de prazer (RP=2,06) sendo R2=28,8% e AIC=60,04. Conclusão: Fatores potencialmente associados com alta prevalência de TMC foram relacionados à formação médica, mostrando que é necessário implementar medidas preventivas e revisão do processo educacional no intuito de reduzir os danos causados pelo desenvolvimento de TMC.

Summary Introduction: Becoming a medical doctor is a very complex process. Factors related to the student’s personality, the educational process and the daily experience with death contribute to peculiar psycho-emotional experiences, not always properly investigated during medical training. Objective: To estimate the prevalence of common mental disorders (CMD) and associated factors, over six years of medical undergraduate course among all students of a class at a public university in Brazil. Method: Cross-sectional study based on repeated surveys. All 40 students enrolled in 2006 in the first year of our medical school were included and evaluated annually until 2011 using the SRQ-20 and a structured questionnaire prepared by the authors on sociodemographic, personal and educational aspects. We performed logistic regression and correspondence analysis. Results: The 40 freshmen in the first evaluation had a mean age of 20 years (SD=2.4), 57.5% were female, and 41% were approved after taking their third entrance exam. The prevalence of CMD increased over the years: from 12.5% in the first year to 43.2% in the fifth. The following variables were potentially associated with CMD: female sex (PR=1.38), originating from capital cities (PR=1.97), the program was less than they expected (PR=3.20), discomfort with program activities (PR=2.10), dissatisfaction with teaching strategies (PR=1.38), and feeling that the program is not a source of pleasure (PR=2.06), being R2=28.8% and AIC=60.04. Conclusion: The factors potentially associated with the high prevalence of CMD were those related to medical training, showing that it is necessary to implement preventive measures and review the educational process in order to reduce the damages caused by the development of CMD.

OBJETIVO: Determinar a prevalência de atopia e avaliar o perfil clínico, laboratorial e radiológico de pacientes com DPOC. MÉTODOS: Estudo de corte transversal com pacientes ambulatoriais portadores de DPOC estável (definida pela história clínica e relação VEF1/CVF < 70% do previsto após broncodilatador). Os pacientes responderam um questionário clínico e de atopia e foram submetidos a citologia de lavado nasal, teste cutâneo de alergia, radiografia de tórax, hemogasometria arterial e dosagem de IgE total. RESULTADOS: Dos 149 indivíduos avaliados, 53 (35,6%), 49 (32,8%) e 88 (59,1%), respectivamente, apresentavam eosinofilia no lavado nasal, teste cutâneo positivo e sintomas de rinite alérgica. A análise de correspondência confirmou esses achados, evidenciando dois perfis distintos de doença: a presença de atopia em pacientes com estágios mais leves de DPOC, e a ausência de características de atopia em pacientes com aspectos de doença mais grave (VEF1 reduzido e hiperinsuflação). Houve uma associação estatisticamente significante entre eosinofilia no lavado nasal e prova farmacodinâmica positiva. CONCLUSÕES: Este estudo identificou uma alta frequência de atopia em pacientes com DPOC, utilizando ferramentas simples e reprodutíveis. A monitorização inflamatória de vias aéreas parece ser uma ferramenta útil para avaliar as doenças respiratórias em idosos, assim como em pacientes com sobreposição de asma e DPOC, entidade clínica ainda pouco compreendida.

OBJECTIVE: To determine the prevalence of atopy and to evaluate clinical, laboratory, and radiological profiles in patients with COPD. METHODS: This was a cross-sectional study involving outpatients with stable COPD (defined by the clinical history and a post-bronchodilator FEV1/FVC < 70% of the predicted value). The patients completed a questionnaire regarding clinical characteristics and atopy, after which they underwent nasal lavage cytology, skin prick testing, chest X-rays, arterial blood gas analyses, and determination of total serum IgE. RESULTS: Of the 149 subjects studied, 53 (35.6%), 49 (32.8%), and 88 (59.1%) presented with nasal eosinophilia, a positive skin prick test result, and symptoms of allergic rhinitis, respectively. Correspondence analysis confirmed these findings, showing two distinct patterns of disease expression: atopy in patients with COPD that was less severe; and no evidence of atopy in those with COPD that was more severe (reduced FEV1 and hyperinflation). There was a statistically significant association between nasal eosinophilia and a positive bronchodilator response. CONCLUSIONS: Using simple and reproducible methods, we were able to show that there is a high frequency of atopy in patients with COPD. Monitoring inflammation in the upper airways can be a useful tool for evaluating respiratory diseases in the elderly and in those with concomitant asthma and COPD, a clinical entity not yet fully understood.