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2009 Novel H1N1 Flu: International Situation Update: March 5, 2010
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March 5, 2010
[PDF-234.03 KB]
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Journal Article:Human Influenza A (H1N1), 2009
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Description:March 5, 2010, 4:30 PM ET
This report provides an update to the international situation using data collected through February 28, 2010, and reported by the World Health Organization (WHO) on March 5. WHO continues to report laboratory-confirmed 2009 H1N1 flu cases and deathsExternal Web Site Iconon 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.
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 14 to February 20, 2010, 75% of all subtyped influenza A viruses were 2009 H1N1 positive. 40.6% of specimens testing positive for influenza were typed as influenza A and 59.4% as influenza B.
The 2009 H1N1 influenza virus is currently most actively being transmitted in parts of Southeast Asia and East and South-eastern Europe. In the temperate zone of the northern hemisphere, transmission is low in most areas. Respiratory disease activity has increased slightly in Mexico and Peru, but it is unclear if this is related to 2009 H1N1. Multiple countries in sub-Saharan Africa are reporting increasing 2009 H1N1 related cases based on limited surveillance data.
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