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Introduction: Globally, depression rates are high among men who have sex with men (MSM). Multiple factors may interact synergistically to increase this risk. This analysis assessed the prevalence of symptoms of depression among MSM in Brazil and synergistic effects of several factors. Methods: Cross-sectional study conducted in 12 cities using respondent-driven sampling. Sociodemographic and behavioral characteristics were collected. The PHQ-9 was used to screen for depression. Having moderate-severe depressive symptoms was compared to none-mild using logistic regression. The syndemic factor was a composite of hazardous alcohol use, sexual violence, and discrimination due to sexual orientation. Those with one to three of these factors were compared to those with none. Results: The weighted prevalence of moderate-severe depressive symptoms was 24.9% (95%CI = 21.8-28.8) and 16.2%, 22.9%, 46.0% and 51.0% when none, one, two, or three syndemic factors were present, respectively, indicating a dose-response effect. Perception of HIV risk, high level of HIV knowledge, known HIV infection, and health self-rated as poor or very poor were also associated with depressive symptoms. Conclusion: The prevalence of moderate-severe depressive symptoms among MSM in Brazil is high, and selected factors act synergistically in increasing their prevalence. Public health policies should consider holistic depression prevention and treatment interventions for this population.

Introduction: High level of HIV/AIDS knowledge is required for an effective adoption of preventive strategies. Objective: To assess HIV/AIDS knowledge among men who have sex with men (MSM) in 12 Brazilian cities. Methods: Respondent-Driven Sampling method was used for recruitment. HIV/AIDS knowledge was assessed by Item Response Theory. Difficulty and discrimination parameters were estimated, and the knowledge score was categorized in three levels: high, medium, and low. Logistic regression was used for analysis. Results: Among 4,176 MSM, the proportion of high level of knowledge was 23.7%. The following variables were positively associated with high knowledge (p < 0.05): age 25+ years old, 12+ years of schooling, white skin color, having health insurance, having suffered discrimination due to sexual orientation, having had a syphilis test, and having received educational material in the previous 12 months. Exchanging sex for money was negatively associated. Conclusions: The proportion of only 23.7% of high HIV/AIDS knowledge was low. We should note that the only potential source of knowledge acquisition associated with high level of knowledge was receiving educational materials. Our study indicates the need for expansion of public prevention policies focused on MSM and with more effective communication strategies, including the development of knowledge that involves motivation and abilities for a safer behavior. Introdução: Alto nível de conhecimento sobre HIV/aids é necessário para uma efetiva adoção de estratégias preventivas. Objetivo: Avaliar o nível de conhecimento sobre HIV/aids entre homens que fazem sexo com homens (HSH) de 12 cidades brasileiras. Metodologia: O método Respondent-Driven Sampling foi utilizado para recrutamento. O conhecimento sobre HIV/aids foi avaliado por meio de 12 perguntas e analisados pela Teoria de Resposta ao Item. Foram estimados os parâmetros de dificuldade e discriminação e o escore de conhecimento categorizado em três níveis: alto, médio e baixo. Regressão logística foi utilizada para a análise. Resultados: Do total de 4.176 HSH, a proporção de alto nível de conhecimento foi de 23,7%. Estiveram associados positivamente (p < 0,05) com o alto conhecimento: idade 25+ anos, escolaridade 12+ anos, cor da pele branca, ter plano de saúde, ter sofrido discriminação devido à orientação sexual, ter realizado teste para sífilis e recebido material educativo nos últimos 12 meses. Ter recebido dinheiro por sexo esteve negativamente associado. Conclusões: A proporção de apenas 23,7% de alto nível de conhecimento sobre HIV/ aids foi baixa. Destaca-se que a única potencial fonte formal de aquisição de conhecimento associada com alto nível de conhecimento foi receber material educativo. Este estudo aponta a necessidade de expandir as políticas públicas de prevenção focadas no segmento HSH e com estratégias de comunicação mais eficazes, incluindo o desenvolvimento de conhecimento que envolva motivação e habilidade para um comportamento mais seguro.