Influenza activity 2000/2001.

Detalhes bibliográficos
Autor(a) principal: Pechirra, Pedro
Data de Publicação: 2005
Outros Autores: Rebelo-de-Andrade, Helena, Guiomar, Raquel, Ribeiro, Carlos, Coelho, Anabela, Pedro, Sónia, George, Francisco
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1006
Resumo: Influenza viral infections are an important cause of morbidity in all age groups and are associated with a high mortality rate amongst the elderly and in risk groups. The current study analyses data from the epidemiological surveillance of influenza during the 2000/2001-winter season. Clinical, epidemiological and virological data relative to cases of influenza syndrome were collected via the National Influenza Surveillance Scheme, in collaboration with the General Directory of Health and integrates the information obtained by the Network of Sentinel Medical Practitioners and Emergency Units. The data analysis hereby obtained shows a low influenza activity during the 2000/2001-winter season, with an epidemiological period characterized by small duration and intensity. The incidence rate of influenza-like illnesses increased above the base line during three weeks and didn't surpass 74 cases per 1,000,000 inhabitants. Influenza B viruses were predominant with the simultaneous presence of influenza A (H1 and H3). The antigenic and genetic characterisation of the isolates allowed the confirmation of the similarity between these viral strains and the vaccine strains as well as the extent of the antigenic drift. Despite the antigenic similarity between the majority of influenza B isolates and the vaccine strains it's noticeable that the genetic characteristics showed an evolution directed towards the B/Sichuan/379/99 strain, which would later be incorporated in the 2001/2002 influenza vaccine. The co-circulation of two different lineages was consequently observed by the phylogenetic analysis of the B strains isolated in our country.
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spelling Influenza activity 2000/2001.Actividade gripal em Portugal no inverno de 2000/2001: análise antigénica e genética das estirpes de vírus influenza.Influenza viral infections are an important cause of morbidity in all age groups and are associated with a high mortality rate amongst the elderly and in risk groups. The current study analyses data from the epidemiological surveillance of influenza during the 2000/2001-winter season. Clinical, epidemiological and virological data relative to cases of influenza syndrome were collected via the National Influenza Surveillance Scheme, in collaboration with the General Directory of Health and integrates the information obtained by the Network of Sentinel Medical Practitioners and Emergency Units. The data analysis hereby obtained shows a low influenza activity during the 2000/2001-winter season, with an epidemiological period characterized by small duration and intensity. The incidence rate of influenza-like illnesses increased above the base line during three weeks and didn't surpass 74 cases per 1,000,000 inhabitants. Influenza B viruses were predominant with the simultaneous presence of influenza A (H1 and H3). The antigenic and genetic characterisation of the isolates allowed the confirmation of the similarity between these viral strains and the vaccine strains as well as the extent of the antigenic drift. Despite the antigenic similarity between the majority of influenza B isolates and the vaccine strains it's noticeable that the genetic characteristics showed an evolution directed towards the B/Sichuan/379/99 strain, which would later be incorporated in the 2001/2002 influenza vaccine. The co-circulation of two different lineages was consequently observed by the phylogenetic analysis of the B strains isolated in our country.Influenza viral infections are an important cause of morbidity in all age groups and are associated with a high mortality rate amongst the elderly and in risk groups. The current study analyses data from the epidemiological surveillance of influenza during the 2000/2001-winter season. Clinical, epidemiological and virological data relative to cases of influenza syndrome were collected via the National Influenza Surveillance Scheme, in collaboration with the General Directory of Health and integrates the information obtained by the Network of Sentinel Medical Practitioners and Emergency Units. The data analysis hereby obtained shows a low influenza activity during the 2000/2001-winter season, with an epidemiological period characterized by small duration and intensity. The incidence rate of influenza-like illnesses increased above the base line during three weeks and didn't surpass 74 cases per 1,000,000 inhabitants. Influenza B viruses were predominant with the simultaneous presence of influenza A (H1 and H3). The antigenic and genetic characterisation of the isolates allowed the confirmation of the similarity between these viral strains and the vaccine strains as well as the extent of the antigenic drift. Despite the antigenic similarity between the majority of influenza B isolates and the vaccine strains it's noticeable that the genetic characteristics showed an evolution directed towards the B/Sichuan/379/99 strain, which would later be incorporated in the 2001/2002 influenza vaccine. The co-circulation of two different lineages was consequently observed by the phylogenetic analysis of the B strains isolated in our country.Ordem dos Médicos2005-02-28info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1006oai:ojs.www.actamedicaportuguesa.com:article/1006Acta Médica Portuguesa; Vol. 18 No. 1 (2005): January-February; 19-25Acta Médica Portuguesa; Vol. 18 N.º 1 (2005): Janeiro-Fevereiro; 19-251646-07580870-399Xreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAPporhttps://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1006https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1006/675Pechirra, PedroRebelo-de-Andrade, HelenaGuiomar, RaquelRibeiro, CarlosCoelho, AnabelaPedro, SóniaGeorge, Franciscoinfo:eu-repo/semantics/openAccess2022-12-20T10:57:18Zoai:ojs.www.actamedicaportuguesa.com:article/1006Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:16:54.280751Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Influenza activity 2000/2001.
Actividade gripal em Portugal no inverno de 2000/2001: análise antigénica e genética das estirpes de vírus influenza.
title Influenza activity 2000/2001.
spellingShingle Influenza activity 2000/2001.
Pechirra, Pedro
title_short Influenza activity 2000/2001.
title_full Influenza activity 2000/2001.
title_fullStr Influenza activity 2000/2001.
title_full_unstemmed Influenza activity 2000/2001.
title_sort Influenza activity 2000/2001.
author Pechirra, Pedro
author_facet Pechirra, Pedro
Rebelo-de-Andrade, Helena
Guiomar, Raquel
Ribeiro, Carlos
Coelho, Anabela
Pedro, Sónia
George, Francisco
author_role author
author2 Rebelo-de-Andrade, Helena
Guiomar, Raquel
Ribeiro, Carlos
Coelho, Anabela
Pedro, Sónia
George, Francisco
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Pechirra, Pedro
Rebelo-de-Andrade, Helena
Guiomar, Raquel
Ribeiro, Carlos
Coelho, Anabela
Pedro, Sónia
George, Francisco
description Influenza viral infections are an important cause of morbidity in all age groups and are associated with a high mortality rate amongst the elderly and in risk groups. The current study analyses data from the epidemiological surveillance of influenza during the 2000/2001-winter season. Clinical, epidemiological and virological data relative to cases of influenza syndrome were collected via the National Influenza Surveillance Scheme, in collaboration with the General Directory of Health and integrates the information obtained by the Network of Sentinel Medical Practitioners and Emergency Units. The data analysis hereby obtained shows a low influenza activity during the 2000/2001-winter season, with an epidemiological period characterized by small duration and intensity. The incidence rate of influenza-like illnesses increased above the base line during three weeks and didn't surpass 74 cases per 1,000,000 inhabitants. Influenza B viruses were predominant with the simultaneous presence of influenza A (H1 and H3). The antigenic and genetic characterisation of the isolates allowed the confirmation of the similarity between these viral strains and the vaccine strains as well as the extent of the antigenic drift. Despite the antigenic similarity between the majority of influenza B isolates and the vaccine strains it's noticeable that the genetic characteristics showed an evolution directed towards the B/Sichuan/379/99 strain, which would later be incorporated in the 2001/2002 influenza vaccine. The co-circulation of two different lineages was consequently observed by the phylogenetic analysis of the B strains isolated in our country.
publishDate 2005
dc.date.none.fl_str_mv 2005-02-28
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https://www.actamedicaportuguesa.com/revista/index.php/amp/article/view/1006/675
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dc.publisher.none.fl_str_mv Ordem dos Médicos
publisher.none.fl_str_mv Ordem dos Médicos
dc.source.none.fl_str_mv Acta Médica Portuguesa; Vol. 18 No. 1 (2005): January-February; 19-25
Acta Médica Portuguesa; Vol. 18 N.º 1 (2005): Janeiro-Fevereiro; 19-25
1646-0758
0870-399X
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