HUG - Laboratoire central de virologie

Influenza activity and virology in Switzerland

During week 10/2010, 2.4 cases of influenza-like illness for 1000 consultations was reported by 116 doctors of the Sentinel monitoring system. This value is lower than the one of last week (2.9/1000). Extrapolated to the whole population, these values correspond to 22 consultations for an influenza-like illness for 100' 000 inhabitants.

This value is now clearly below the national threshold (approximately 50/100' 000). The national epidemic threshold was bypassed during the week 43 (19 weeks ago). The peak was observed in our country during the week 49. Sporadic influenza cases will still occur in the coming weeks. The number of consultations for influenza-like illness extrapolated to the whole population is of 292‘000 since the first influenza A (H1N1) detection at the end of April 2009. During the week 10, no influenza activity was reported in any Sentinel region.

Hospitalisation: since the week 4/2010, no new hospitalisation due to influenza A (H1N1) virus was observed. Since July 2009, 564 hospitalisations were declared; 108 patients required intensive care and 19 deceased.

Virology: During week 10/2010, no influenza viruses A (H1N1) pandemic 2009 was detected among 9 patients tested in the Sentinel network. Outside the Sentinel system, no influenza A virus was registered in the obligatory reporting system during the week 10/2010.

Influenza viruses detected per week and

proportion of medical contacts for influenza-like illness (ILI) for 1000 consultations

Cases are classified according to the date when the sample was taken.

A (H3N2) seasonal: influenza A (H3N2) virus
A (H1N1) seasonal: influenza A (H1N1) virus
A (H1N1)v 2009: influenza A (H1N1) pandemic 2009
Flu.A undet.: influenza A virus that is under subtypisation analysis
B : influenza B viruses
‰ ILI : percentage of consultation for influenza-like illness per week reported to the Swiss Federal Office of Public Health by the Sentinella doctors.

Europe

WHO/Europe influenza surveillance

http://www.euroflu.org/html/maps.html

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Dernière modification le 18/03/2010