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Novel H1N1 Flu: International Situation Update: December 18, 2009
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December 18, 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 18, 2009. The World Health Organization (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. The 2009 H1N1 influenza virus continues to be the dominant influenza virus in circulation in the world. For the most recent period in which data are available, from November 15 to December 5, 2009, 92.2% of influenza specimens reported to WHO were 2009 H1N1, 1% were seasonal A (H1), 0.9% were A (H3), 5.2% were influenza A viruses that were not subtyped, and 0.8% were influenza B viruses. In temperate regions of the Southern Hemisphere, sporadic cases of 2009 H1N1 have been reported in recent weeks but no sustained transmission has been observed. 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 has passed its peak in North America and in parts of Western and Northern Europe, but activity continues to increase in parts of Central and Southeastern Europe, as well as in South and Central Asia.
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