Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil

Detalhes bibliográficos
Autor(a) principal: VILLAR, Livia Melo
Data de Publicação: 2002
Outros Autores: DE PAULA, Vanessa Salete, GASPAR, Ana Maria Coimbra
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Revista do Instituto de Medicina Tropical de São Paulo
Texto Completo: https://www.revistas.usp.br/rimtsp/article/view/30644
Resumo: Hepatitis A virus (HAV) infection constitutes a major public health problem in Brazil. The transmission of HAV is primarily by fecal-oral route so the water is an important vehicle of HAV dissemination. There is a great incidence of acute cases of hepatitis A in some areas of Brazil however the seasonal variation of these cases was not documented. The aim of this study was to determine the seasonality of HAV infection in Rio de Janeiro. From January 1999 to December 2001, 1731 blood samples were collected at the National Reference Center for Hepatitis Viruses in Brazil (NRCHV). These samples were tested by a commercial enzyme-immunoassay to detect anti-HAV IgM antibodies. Yearly positive rates were 33.74% in 1999, 32.19% in 2000, and 30.63% in 2001. A seasonal variation was recognized with the highest incidence in spring and summer. Furthermore a seasonal increase in incidence of HAV infection was found during the rainy season (December to March) because the index of rains is very high. It is concluded that HAV infections occur all year round with a peak during hot seasons with great number of rains.
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spelling Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil Variação sazonal da infecção pelo vírus da hepatite A no Rio de Janeiro, Brasil Hepatitis ASeasonal variationRio de Janeiro Hepatitis A virus (HAV) infection constitutes a major public health problem in Brazil. The transmission of HAV is primarily by fecal-oral route so the water is an important vehicle of HAV dissemination. There is a great incidence of acute cases of hepatitis A in some areas of Brazil however the seasonal variation of these cases was not documented. The aim of this study was to determine the seasonality of HAV infection in Rio de Janeiro. From January 1999 to December 2001, 1731 blood samples were collected at the National Reference Center for Hepatitis Viruses in Brazil (NRCHV). These samples were tested by a commercial enzyme-immunoassay to detect anti-HAV IgM antibodies. Yearly positive rates were 33.74% in 1999, 32.19% in 2000, and 30.63% in 2001. A seasonal variation was recognized with the highest incidence in spring and summer. Furthermore a seasonal increase in incidence of HAV infection was found during the rainy season (December to March) because the index of rains is very high. It is concluded that HAV infections occur all year round with a peak during hot seasons with great number of rains. A infecção pelo vírus da hepatite A constitui um dos maiores problemas de saúde pública no Brasil. A transmissão do HAV ocorre principalmente pela via orofecal deste modo a água é um importante veículo da disseminação do HAV. Existe uma alta incidência de casos agudos de hepatite A em algumas áreas do Brasil entretanto a variação sazonal destes casos não foi relatada. O objetivo deste estudo foi avaliar a sazonalidade da infecção pelo HAV no Rio de Janeiro. De janeiro de 1999 a dezembro de 2001, 1731 amostras de sangue foram coletadas no Centro Nacional de Referência para Hepatites Virais no Brasil (CRNHV). Estas amostras foram testadas por um ensaio imunoenzimático comercial para detectar anticorpos IgM anti-HAV. Taxas de positividade anuais foram de 33,74% em 1999, 32,19% em 2000, e 30,63% em 2001. Uma variação sazonal foi observada com um alto índice na primavera e verão. Também foi observado um aumento sazonal na incidência da infecção pelo HAV durante a estação chuvosa (Dezembro a Março) pois o índice de chuvas é muito alto. Foi concluído que a infecção pelo HAV ocorre o ano todo com um pico durante estações quentes com grande número de chuvas. Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo2002-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/rimtsp/article/view/30644Revista do Instituto de Medicina Tropical de São Paulo; Vol. 44 No. 5 (2002); 289-292 Revista do Instituto de Medicina Tropical de São Paulo; Vol. 44 Núm. 5 (2002); 289-292 Revista do Instituto de Medicina Tropical de São Paulo; v. 44 n. 5 (2002); 289-292 1678-99460036-4665reponame:Revista do Instituto de Medicina Tropical de São Pauloinstname:Instituto de Medicina Tropical (IMT)instacron:IMTenghttps://www.revistas.usp.br/rimtsp/article/view/30644/32528Copyright (c) 2018 Revista do Instituto de Medicina Tropical de São Pauloinfo:eu-repo/semantics/openAccessVILLAR, Livia MeloDE PAULA, Vanessa SaleteGASPAR, Ana Maria Coimbra2012-07-07T17:53:15Zoai:revistas.usp.br:article/30644Revistahttp://www.revistas.usp.br/rimtsp/indexPUBhttps://www.revistas.usp.br/rimtsp/oai||revimtsp@usp.br1678-99460036-4665opendoar:2022-12-13T16:51:25.094339Revista do Instituto de Medicina Tropical de São Paulo - Instituto de Medicina Tropical (IMT)true
dc.title.none.fl_str_mv Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
Variação sazonal da infecção pelo vírus da hepatite A no Rio de Janeiro, Brasil
title Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
spellingShingle Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
VILLAR, Livia Melo
Hepatitis A
Seasonal variation
Rio de Janeiro
title_short Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
title_full Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
title_fullStr Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
title_full_unstemmed Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
title_sort Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
author VILLAR, Livia Melo
author_facet VILLAR, Livia Melo
DE PAULA, Vanessa Salete
GASPAR, Ana Maria Coimbra
author_role author
author2 DE PAULA, Vanessa Salete
GASPAR, Ana Maria Coimbra
author2_role author
author
dc.contributor.author.fl_str_mv VILLAR, Livia Melo
DE PAULA, Vanessa Salete
GASPAR, Ana Maria Coimbra
dc.subject.por.fl_str_mv Hepatitis A
Seasonal variation
Rio de Janeiro
topic Hepatitis A
Seasonal variation
Rio de Janeiro
description Hepatitis A virus (HAV) infection constitutes a major public health problem in Brazil. The transmission of HAV is primarily by fecal-oral route so the water is an important vehicle of HAV dissemination. There is a great incidence of acute cases of hepatitis A in some areas of Brazil however the seasonal variation of these cases was not documented. The aim of this study was to determine the seasonality of HAV infection in Rio de Janeiro. From January 1999 to December 2001, 1731 blood samples were collected at the National Reference Center for Hepatitis Viruses in Brazil (NRCHV). These samples were tested by a commercial enzyme-immunoassay to detect anti-HAV IgM antibodies. Yearly positive rates were 33.74% in 1999, 32.19% in 2000, and 30.63% in 2001. A seasonal variation was recognized with the highest incidence in spring and summer. Furthermore a seasonal increase in incidence of HAV infection was found during the rainy season (December to March) because the index of rains is very high. It is concluded that HAV infections occur all year round with a peak during hot seasons with great number of rains.
publishDate 2002
dc.date.none.fl_str_mv 2002-10-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://www.revistas.usp.br/rimtsp/article/view/30644
url https://www.revistas.usp.br/rimtsp/article/view/30644
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://www.revistas.usp.br/rimtsp/article/view/30644/32528
dc.rights.driver.fl_str_mv Copyright (c) 2018 Revista do Instituto de Medicina Tropical de São Paulo
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Copyright (c) 2018 Revista do Instituto de Medicina Tropical de São Paulo
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
publisher.none.fl_str_mv Universidade de São Paulo. Instituto de Medicina Tropical de São Paulo
dc.source.none.fl_str_mv Revista do Instituto de Medicina Tropical de São Paulo; Vol. 44 No. 5 (2002); 289-292
Revista do Instituto de Medicina Tropical de São Paulo; Vol. 44 Núm. 5 (2002); 289-292
Revista do Instituto de Medicina Tropical de São Paulo; v. 44 n. 5 (2002); 289-292
1678-9946
0036-4665
reponame:Revista do Instituto de Medicina Tropical de São Paulo
instname:Instituto de Medicina Tropical (IMT)
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instname_str Instituto de Medicina Tropical (IMT)
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reponame_str Revista do Instituto de Medicina Tropical de São Paulo
collection Revista do Instituto de Medicina Tropical de São Paulo
repository.name.fl_str_mv Revista do Instituto de Medicina Tropical de São Paulo - Instituto de Medicina Tropical (IMT)
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