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Monday, October 25, 2010

WHO : Influenza update - 20 October 2010

The latest influenza update from WHO, dated 20th October 2010, excerpt :

" Influenza - Update 119

20 October 2010 - Summary:

Influenza activity in the temperate regions of the Southern Hemisphere is continuing to decline. In most of the temperate regions of the Northern Hemisphere the level of activity is still low. Influenza virus A(H3N2) continues to be the most frequently detected virus world wide. Most of the influenza A(H3N2) viruses are A/Perth/16/2009-like,which is the virus strain included in the seasonal vaccines for the Northern and Southern Hemispheres.

Southern hemisphere temperate countries

This winter's influenza season in the temperate countries in the southern hemisphere has peaked and is declining in most areas.

New Zealand's influenza activity has decreased since late August and is now under baseline for the third consecutive week. The most common influenza virus detected this season in New Zealand is H1N1 (2009). In Australia the influenza surveillance indicated an increase in the activity in the last week of September, Australia has had a co-circulation of mainly H1N1 (2009) and influenza B.

In the southern cone of South America, Chile continues to report high transmission of influenza but since mid September the activity has declined. The predominant virus circulating in Chile has been A(H3N2) with co-circulation of H1N1 (2009) in lower numbers. Detections of other respiratory viruses such as respiratory syncytial virus are also declining. Argentina and Uruguay have both had a season with mostly influenza type B, and are now reporting a decrease in number of virus detections."

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