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Revista Brasileira de Epidemiologia
Print version ISSN 1415-790X
GOMES, Márcia Andréa Costa; FERREIRA, Adalgisa de Sousa Paiva; SILVA, Antonio Augusto Moura da and SOUZA, Eliane Rabelo de. Hepatitis A: seroprevalence and associated factors among schoolchildren of São Luís (MA), Brazil. Rev. bras. epidemiol. [online]. 2011, vol.14, n.4, pp.548-555. ISSN 1415-790X. http://dx.doi.org/10.1590/S1415-790X2011000400002.
OBJECTIVES: To estimate the prevalence of antibodies to hepatitis A virus (antiVHA-IgG) in children aged 7-14 years from public and private schools, and to identify demographic, socioeconomic and sanitation factors associated with the prevalence of antiVHA-IgG. METHODS: Seroepidemiological study for the detection of IgG antiVHA. It was conducted from April 2002 to April 2004 with 462 elementary school students from São Luis, ranging from 7 to 14-years of age. Thirty schools randomly selected took part in the study, with a probability proportional to the number of students enrolled; 23 schools were public and 7 were private. Data was obtained through a structured questionnaire. In order to identify the variables independently associated with IgG antiVHA, the Poisson multiple regression analysis was performed, estimating the adjusted PRs and their 95% confidence intervals. The variables associated with the prevalence of hepatitis A with p < 0 were the only ones that remained in the final model. The level of significance of 0.05 (α = 0.05) was adopted. RESULTS: The prevalence of antiVHA-IgG was 64%, 71.5% in public and 36.5% in private schools. After multivariate analysis, age 11 to 14 years, more than one person per bedroom, and less than two bathrooms per household were associated with a higher prevalence of antiVHA-IgG. Higher parental education was associated with lower prevalence of antiVHA-IgG. CONCLUSIONS: Hepatitis A is endemic among schoolchildren in São Luís. The prevalence rate was similar to those found in other regions of the country with similar socio-economic and health conditions. Factors historically associated with a higher prevalence of hepatitis A were also identified in this population.
Keywords : Hepatitis A; Prevalence; AntiVHA-IgG; Schoolchildren; Seroepidemiologic survey.