ArticleEpidemiologia e servicos de saude : revista do Sistema Unico de Saude do Brasil2026
Seroprevalence of hepatitis A in adolescent students: A cross-sectional study in Curitiba, Paraná, 2024.
Article in Epidemiologia e servicos de saude : revista do Sistema Unico de Saude do Brasil, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
objectiveEstimate the seroprevalence of antibodies against Hepatitis A Virus (anti-HAV)-Immunoglobulin G (IgG) and Immunoglobulin M (IgM)-among adolescent students in Curitiba, Paraná, in the context of an outbreak, and identify the proportion of natural infections and vaccine immunity.
methodsA cross-sectional study based on a serological survey was conducted between July 3 and 5, 2024 in five state schools. Stratified random sampling was proportional to the total number of students per school. Adolescents aged 10-19 years were included with individual and legal guardian consent. Collection was conducted in the schools and the samples were analyzed by chemiluminescence for anti-HAV antibodies detection. Information on vaccination was obtained from the municipality's database. Statistical analyses included calculation of proportions, chi-square tests, and Fisher's exact test.
resultsOf the 216 samples, 35 (16.2%; 95%CI 11.9; 21.7) were reactive for anti-HAV IgG, indicating previous immunity; none of the samples showed reactive IgM. IgG prevalence among the unvaccinated was 4.6% and 11.6% among the vaccinated. Of the 25 previously vaccinated reactive cases, all were in the 10-14 years age group. Of the ten reactive by natural exposure, five were in the 10-14 years age group and five in the 15-19 years age group. IgG seroprevalence showed no significant difference by gender (p-value 0.685) or school (p-value 0.078).
conclusionSeroprevalence of anti-HAV IgG among adolescents in Curitiba was low, predominating vaccine immunity over that acquired by natural exposure, and absence of acute infection cases.
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