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Novel H1N1 flu : international situation update ; December 4, 2009
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December 4, 2009
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Journal Article:Human Influenza A (H1N1), 2009
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Description:This report provides an update to the international situation as of December 4, 2009. The World Health Organization (WHO) continues to report laboratory-confirmed 2009 H1N1 flu cases and deaths External Web Site Iconon its Web page. These laboratory-confirmed cases represent a substantial underestimation of total cases in the world, as many countries focus surveillance and laboratory testing only on people with severe illness. The 2009 H1N1 influenza virus continues to be the dominant influenza virus in circulation in the world. From April 19 to November 21, 2009, 71.4% of influenza specimens reported to WHO were 2009 H1N1 viruses and from November 15 to November 21, 2009, more than 93% of influenza specimens reported to WHO were 2009 H1N1. In temperate regions of the Southern Hemisphere, little disease activity due to 2009 H1N1 has been reported. In tropical regions of the Americas and Asia, influenza activity due to 2009 H1N1 remains variable. In temperate regions of the Northern Hemisphere, influenza-like illness (ILI) activity due to 2009 H1N1 remains high across many countries in Europe and North America, though it may have peaked in most areas of the United States, Canada, and Northern and Western Europe.
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