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Novel H1N1 flu : international situation update ; October 2, 2009
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October 2, 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 October 2, 2009. As of September 20, 2009, the World Health Organization (WHO) regions have reported at least 318,925 laboratory-confirmed cases of 2009 H1N1 with more than 3,917 deaths, which is an increase of at least 22,454 cases and 431 deaths since September 13. The 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 September 12, 2009, 60.6% of influenza specimens reported to WHO were 2009 H1N1 viruses. In temperate regions of the Southern Hemisphere, disease due to 2009 H1N1 is declining or has returned to baseline. In tropical regions of the Americas and Asia, influenza activity due to 2009 H1N1 remains variable. In temperate regions of the Northern Hemisphere, there is increased influenza-like illness (ILI) activity due to 2009 H1N1 in many areas, including in most of the United States, parts of Mexico and Canada, and in some countries in Europe.
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