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Monday, September 12, 2011

WHO : Influenza update - 09 September 2011

The latest influenza update from WHO, update 142, excerpt :

" Summary

Countries in the temperate regions of the northern hemisphere reported low or undetectable influenza activity. The United States of America (USA) has recently reported four human cases of swine influenza A(H3N2) containing a novel reassortment with an M gene derived from influenza A(H1N1)2009.

Influenza activity the tropical zone was mostly low with the exception of a few countries of the Americas (Cuba and Honduras), Western Africa (Cameroon and Senegal), and Southern Asia (Bangladesh and Thailand) that reported continued transmission.

In South America the influenza season has been mild and has peaked with variation in the predominant type and subtype of virus circulating in different countries in the area. Influenza activity may have peaked nationally in Australia, though regional increases are still being reported. New South Wales, Australia has recently reported a cluster of 25 cases with oseltamivir-resistant influenza A(H1N1)2009 virus infection.

The cases occurred in a limited geographic area but occurred over a three month period of time. Of note, none of the cases interviewed had previously been exposed to oseltamivir or had other risk factors previously associated with the development of oseltamivir resistance. This represents the largest cluster of oseltamivir resistant viruses to date and the most persistent period of community transmission. Investigations are ongoing to determine the full extent of spread of the virus.:

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