National influenza centre in Switzland, Influenza activity in Switzerland : actual situation 20/04/2011

National influenza centre in Switzland

http://www.virologie.hug-ge.ch/centres_reference/CNI_surveillance_en.html

Influenza activity in Switzerland : actual situation

Up-date 20th April 2011

 

Influenza activity and virology in Switzerland

 

Influenza activity reached back the level observed before the season start. 

High majority of circulating strains are antigenically related to vaccine strains: influenza A/California/7/2009 (H1N1) and B/Brisbane/60/2008. Around 10% of influenza B strains are more related to influenza B/Wisconsin/01/2010, which is distinct from the vaccine strain.

Influenza A (H3N2) viruses that have been detected sporadically until now were genetically related to the vaccine strain influenza A/Perth/16/2009 (H3N2).

 

Until now, 82 NA genes of influenza A (H1N1) 2009 were sequenced and no known resistance mutation was detected. 

For further information, consult FOPH site: FOPH - Influenza

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) 2009: influenza A (H1N1) pandemique 2009Flu.A undet.: influenza A virus that is under subtypisation analysisB : 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.

WHO/Europe influenza surveillance

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

For more information:

- on pandemic influenza, click here

Dernière modification le 20/04/2011

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