Seasonal variation of hepatitis A virus infection in the city of Rio de Janeiro, Brazil
Autor(a) principal: | |
---|---|
Data de Publicação: | 2002 |
Outros Autores: | , |
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. |
id |
IMT-1_bcd881ac26cb1deae78cfd7b3b04fa4a |
---|---|
oai_identifier_str |
oai:revistas.usp.br:article/30644 |
network_acronym_str |
IMT-1 |
network_name_str |
Revista do Instituto de Medicina Tropical de São Paulo |
repository_id_str |
|
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) instacron:IMT |
instname_str |
Instituto de Medicina Tropical (IMT) |
instacron_str |
IMT |
institution |
IMT |
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) |
repository.mail.fl_str_mv |
||revimtsp@usp.br |
_version_ |
1798951643867250688 |