Influenza surveillance during 2015/2016 season in Portugal

Guiomar, Raquel; Rodrigues, Ana Paula; Nunes, Baltazar; Silva, Susana; Pechirra, Pedro; Cristóvão, Paula; Costa, Inês; Conde, Patrícia

Publication

Influenza surveillance during 2015/2016 season in Portugal

2016-06-15Conference object

dc.contributor.author	Guiomar, Raquel
dc.contributor.author	Rodrigues, Ana Paula
dc.contributor.author	Nunes, Baltazar
dc.contributor.author	Silva, Susana
dc.contributor.author	Pechirra, Pedro
dc.contributor.author	Cristóvão, Paula
dc.contributor.author	Costa, Inês
dc.contributor.author	Conde, Patrícia
dc.date.accessioned	2017-03-24T10:43:29Z
dc.date.available	2017-03-24T10:43:29Z
dc.date.issued	2016-06-15
dc.description.abstract	During 2015/2016 season the influenza activity was low and the epidemic period occurred between week 1/2015 and 9/2016 with a maximum of 59.4 ILI cases per 105 inhabitants in week 3/2015.No impact on mortality for all causes was observed in any age group. The influenza A(H1)pdm09 was predominant (94% of flu confirmed cases). Influenza B/ Victoria was identified sporadically (4% of flu cases) in late season. Situation that contrasts with European influenza picture, that showed a late peak of influenza B/ Victoria. Other respiratory viruses were detected in influenza negative cases, rhinovirus and coronavirus in higher frequencies. The antigenic and genetic analysis of circulating influenza A(H1)pdm09 showed similarity with vaccine strain. The majority of influenza B virus belonged to Victoria lineage and clade 1A, dissimilar from 2015/16 vaccine strain. Although few A(H3) viruses in circulation, almost all AH3 viruses were similar to strain recommended for next winter vaccine. Low influenza activity level can be linked with a higher influenza activity in last season and exceptional climatic conditions during the winter (higher temperature than usual). Predominance of A(H1)pdm09 and circulation of B/Victoria, recorded in all age groups, is in line with 2015 serosurvey that showed lower levels of seroprotection for these viruses comparing to A(H3) and B/Yamagata lineage.	pt_PT
dc.description.version	N/A	pt_PT
dc.identifier.uri	http://hdl.handle.net/10400.18/4695
dc.language.iso	eng	pt_PT
dc.peerreviewed	no	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by-nc/4.0/	pt_PT
dc.subject	Gripe	pt_PT
dc.subject	Influenza	pt_PT
dc.subject	Vigilância Epidemiológica	pt_PT
dc.subject	2015/2016	pt_PT
dc.title	Influenza surveillance during 2015/2016 season in Portugal	pt_PT
dc.type	conference object
dspace.entity.type	Publication
oaire.citation.conferencePlace	Budapest, Hungria	pt_PT
oaire.citation.title	Joint ECDC-WHO/Europe Annual European Influenza Surveillance Meeting, 14-16 Jun 2016	pt_PT
rcaap.rights	openAccess	pt_PT
rcaap.type	conferenceObject	pt_PT