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Novel H1N1 flu : international situation update ; January 4, 2010
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January 4, 2010
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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 January 4, 2010. The World Health Organization (WHO) continues to report laboratory-confirmed 2009 H1N1 flu cases and deathsExternal Web Site IconExternal Web Site IconExternal Web Site Icon on its Web page. 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 December 13 to December 19, 2009, 87% of influenza specimens reported to WHO were 2009 H1N1, 0.2% were seasonal A (H1), 1.6% were A (H3), 7.7% were influenza A viruses that were not subtyped, and 3.4% were influenza B viruses. In temperate regions of the Southern Hemisphere, sporadic cases of 2009 H1N1 continue to be reported but no sustained community 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 returned to baseline or below baseline in North America. Overall, pandemic influenza activity appears to have peaked in most Western European countries but remains active in Central and Eastern European countries. In Western and Central Asia, influenza activity continues to persist above baseline levels.
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