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2009 Novel H1N1 Flu: International Situation Update: February 19, 2010
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February 19, 2010
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Journal Article:Human Influenza A (H1N1), 2009
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Description:February 19, 2010, 3:30 PM ET
This report provides an update to the international situation using data collected through February 14, 2010, and reported by the World Health Organization (WHO) on February 19. WHO continues to report laboratory-confirmed 2009 H1N1 flu cases and deaths 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.
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 27 countries from January 31, 2010 to February 6, 2010, 93% of specimens testing positive for influenza were typed as influenza A and 7% as influenza B. Out of all subtyped influenza A viruses, 97% were 2009 H1N1 positive.
In temperate regions of the Southern Hemisphere, sporadic cases of 2009 H1N1 continue to be reported but no substantial increases in influenza activity have been observed. In the temperate Northern Hemisphere, active but declining 2009 H1N1 influenza transmission persists in certain areas of Eastern and Southern Europe, South Asia, and East Asia. In tropical regions of Asia, several countries reported an increasing trend of influenza activity but overall intensity remains low. An increasing trend in influenza activity was reported by several countries in West Africa, Thailand, and Jamaica.
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