2009 Novel H1N1 Flu: International Situation Update: March 12, 2010
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2009 Novel H1N1 Flu: International Situation Update: March 12, 2010

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  • Journal Article:
    Human Influenza A (H1N1), 2009
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    March 12, 2010, 5:30 PM ET

    This report provides an update to the international situation using data collected through March 7, 2010, and reported by the World Health Organization (WHO) on March 12. WHO continues to report laboratory-confirmed 2009 H1N1 flu cases and deaths. These laboratory-confirmed cases represent a substantial underestimation of total cases in the world, as most countries focus surveillance and laboratory testing only on people with severe illness.

    In nearly all countries of the world where influenza infection is reported, the 2009 H1N1 influenza virus continues to predominate among all subtyped influenza A viruses. Based on FluNet data collected by 28 countries from February 21 to February 27, 2010, 92.8% of all subtyped influenza A viruses were 2009 H1N1 positive. Among specimens that tested positive for influenza, 69.2% were typed as influenza A and 30.8% as influenza B.

    The 2009 H1N1 virus is currently most actively being transmitted in Southeast Asia. Limited data suggests increases in 2009 H1N1 activity in West Africa. Influenza B viruses are the predominant virus subtype in some countries in Asia and appear to be increasing in other parts of the world, too. 2009 H1N1 activity remains low in the Americas and in the temperate zone of the Southern Hemisphere.

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