Occurrence of hepatitis B and C virus infection in socioeconomic population strata from Recife, Pernambuco, Northeast Brazil.

OBJECTIVE: To estimate the probability of infection with hepatitis B (HBV) and C (HCV) viruses in different socioeconomic strata of the population of Recife, Northeast Brazil. METHODS: Study carried out from samples obtained in a survey of residents of a large urban center that had a population base and stratified sampling with random selection of households using the "Brazil Sample" package in the R software. HBV (HBsAg) and anti-HCV was performed using immunochromatographic tests. In cases positive for HBsAg, anti-HBc and HBeAg were tested using chemiluminescence, as well as HBV-DNA using real-time PCR. For cases positive for anti-HCV, the search for this antibody was repeated by chemiluminescence and for HCV-RNA by real-time PCR. The occurrence of HBsAg and anti-HCV cases in the general population was estimated based on a theoretical negative binomial distribution. RESULTS: Among 2,070 samples examined, 5 (0.24%) were HBsAg and 2 (0.1%) anti-HCV positive. The majority of cases had self-reported skin color as black/brown (6/7), education level up to high school (6/7), a steady partner (5/7) and lived in an area of low socioeconomic status (5/7). CONCLUSION: The occurrence of HBsAg and anti-HCV was lower than those previously found in population-based studies and slightly lower than the most recent estimates. Individuals with lower socioeconomic status should be a priority target of public health policies.

Occurrence of hepatitis B and C virus infection in socioeconomic population strata from Recife, Pernambuco, Northeast Brazil / Ocorrência da infecção pelo vírus das hepatites B e C em estratos socioeconômicos populacionais do município de Recife, Pernambuco, Nordeste do Brasil

ABSTRACT Objective: To estimate the probability of infection with hepatitis B (HBV) and C (HCV) viruses in different socioeconomic strata of the population of Recife, Northeast Brazil. Methods: Study carried out from samples obtained in a survey of residents of a large urban center that had a population base and stratified sampling with random selection of households using the "Brazil Sample" package in the R software. HBV (HBsAg) and anti-HCV was performed using immunochromatographic tests. In cases positive for HBsAg, anti-HBc and HBeAg were tested using chemiluminescence, as well as HBV-DNA using real-time PCR. For cases positive for anti-HCV, the search for this antibody was repeated by chemiluminescence and for HCV-RNA by real-time PCR. The occurrence of HBsAg and anti-HCV cases in the general population was estimated based on a theoretical negative binomial distribution. Results: Among 2,070 samples examined, 5 (0.24%) were HBsAg and 2 (0.1%) anti-HCV positive. The majority of cases had self-reported skin color as black/brown (6/7), education level up to high school (6/7), a steady partner (5/7) and lived in an area of low socioeconomic status (5/7). Conclusion : The occurrence of HBsAg and anti-HCV was lower than those previously found in population-based studies and slightly lower than the most recent estimates. Individuals with lower socioeconomic status should be a priority target of public health policies.

RESUMO Objetivo: Estimar a probabilidade da ocorrência de infecção pelos vírus das hepatites B (HBV) e C (HCV) em diferentes estratos socioeconômicos da população de Recife, Nordeste do Brasil. Métodos: Estudo realizado com base em amostras obtidas em um inquérito de residentes de um grande centro urbano que teve base populacional e amostragem estratificada com seleção aleatória dos domicílios por meio do pacote "Amostra Brasil" no software R. A pesquisa do antígeno de superfície do HBV (HBsAg) e do anti-HCV foi realizada por testes imunocromatográficos. Nos casos positivos para HBsAg, foram realizadas pesquisas do anti-HBc e do HBeAg por quimioluminescência, bem como do HBV-DNA, por meio de PCR em tempo real. Para os casos positivos para anti-HCV, foi repetida a pesquisa desse anticorpo por quimioluminescência e do HCV-RNA por PCR em tempo real. A ocorrência de casos HBsAg e anti-HCV na população geral foi estimada com base em uma distribuição teórica binomial negativa. Resultados: Dentre 2.070 amostras examinadas, cinco (0,24%) foram HBsAg e duas (0,1%) anti-HCV positivas. A maioria dos casos tinha cor de pele autorreferida como preta/parda (6/7), nível de escolaridade até o ensino médio (6/7), companheiro fixo (5/7) e morava em área de baixo estrato socioeconômico (5/7). Conclusão: A ocorrência de HBsAg e anti-HCV foi inferior às anteriormente encontradas em estudos de base populacional e pouco menor do que as estimativas mais recentes. Indivíduos que apresentam menor condição socioeconômica devem ser alvo prioritário das políticas públicas de saúde.

Association of rs1285933 single nucleotide polymorphism in CLEC5A gene with dengue severity and its functional effects.

Outbreaks of the Zika, dengue, and chikungunya viruses, especially in the Americas, pose a global threat due to their rapid spread and difficulty controlling the vector. Extreme phenotypes are often observed, from asymptomatic to severe clinical manifestations, which are well-studied in dengue. Host variations are also important contributors to disease outcomes, and many case-control studies have associated single nucleotide polymorphisms (SNPs) with severe dengue. Here, we found that the TC genotype and T-carriers for SNP rs1285933 in the C-type lectin superfamily member 5 (CLEC5A) gene was associated with severe dengue in a Northern Brazilian population (OR=2.75 and p-value=0.01, OR=2.11 and p-value=0.04, respectively). We also tested the functional effect of the CLEC5A protein and found that it is upregulated on the surface of human monocytes after in vitro dengue infection. CLEC5A was correlated with viral load inside the monocytes (Spearman r=0.55, p=0.008) and TNF production in culture supernatants (Spearman r=0.72, p=0.03). Analysis of mRNA in blood samples from DENV4-infected patients exhibiting mild symptoms showed that CLEC5A mRNA expression is correlated with TNF (r=0.67, p=0.0001) and other immune mediators. Monocytes from rs1285933 TT/TC individuals showed lower CLEC5A expression compared to CC genotypes. However, in these cells, CLEC5A was not correlated with TNF production. In summary, we confirmed that CLEC5A is genetically associated with dengue severity outcome, playing a central role during the immune response triggered by a dengue viral infection, and rs1285933 is a relevant SNP that is able to regulate signaling pathways after interactions between the dengue virus and CLEC5A receptors.