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Influenza activity in Switzerland : actual situation
Up-date 24 April 2013
Welcome to all of you !
The surveillance is a collaboration between FOPH and the NRCI. You will find below a copy of the influenza surveillance report edited in the weekly bulletin communicated by FOPH. We hope that these informations will be useful and wish you a a winter season as peaceful as possible.
National Reference Centre of Influenza team:
Yves Thomas, PhD Patricia Boquete-Suter Pr Laurent Kaiser, MD
Virological activity in Switzerland during the week 16/2013
During the week 16, 134 practitioners of the Sentinel system reported 1.2 cases of influenza suspicion on 1’000 consultations. This rate has been the same compared to the one reported previous week (2.9 cases for 1000 consultations). Extrapolated to the whole population, it corresponds to 8 consultations for an influenza-like illness for 100’000 inhabitants. Since the week 13/2013, the incidence is under the Swiss epidemic threshold. Table 1: Incidence of consultations du to an influenza-like illness according to age and region for 100'000 inhabitants during week 16/2013
The two Sentinella regions « GE, NE, VD, VS » et « AI, AR, GL, SG, SH, TG, ZH » have only recorded a sporadic activity and the other regions have not registered any influenza activity (Table 1, Box).
During week 16, the national reference center for influenza has highlighted influenza virus in 2 of the 5 samples analyzed in the framework of the monitoring system Sentinella. One of these viruses was an influenza A virus, the other an influenza B virus. All 59 influenza viruses antigenically and genetically analyzed from week 40/2012 - 37 Influenza A (H1N1)pdm09 and 22 Influenza A (H3N2) - matched to the vaccine strains against seasonal influenza in 2012 [1]. In addition of Influenza B Yamagata lineage, virus Influenza B Victoria lineage have also rarely been highlighted, these are not included in the vaccine in 2012. Total coverage of influenza virus vaccine in circulation remains good.
Influenza activity in Europe
Weekly bulletin of the EISN: click here
Références [1] WHO / Europe influenza surveillance (EuroFlu.org) Links
Annual report on influenza activity during the 2011-12 season: Influenza 2011-12.pdf
An interesting and original study was conducted on influenza infection at the university hospital of Geneva. The article can be accessed here: Iten et al, 2012. « Prévention de la grippe dans les Hôpitaux, un défi à relever », Bulletin 41, p696-698
Influenza viruses detected per week and Cases are classified according to the date when the sample was taken and
FluA undet.: influenza A virus that is under subtypisation analysis proportion of medical contacts for influenza-like illness (ILI) for 1000 consultations B: influenza B viruses
A (H3N2) seasonal: influenza A (H3N2) virus
A (H1N1) seasonal: influenza A (H1N1) virus A (H1N1) 2009: influenza A (H1N1) pandemique 2009 ‰ ILI : percentage of consultation for influenza-like illness per week reported to the Swiss Federal Office of Public Health by the Sentinella doctors.
http://www.euroflu.org/html/maps.html Dernière modification le 24/04/2013 Table 2:Types and sub-types of Influenza viruses circulating in Switzerland during the week 15/2013 and cumulated data since week 40/2012 |
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