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2009 H1N1 Flu: International Situation Update

This website is archived for historical purposes and is no longer being maintained or updated. For updated information on the current flu season, see the CDC Seasonal Flu website.

June 11, 2010, 6:00 PM ET

This report provides an update to the international flu situation using data collected through June 6, 2010, and reported by the World Health Organization (WHO) on June 11.

WHO continues to report laboratory-confirmed 2009 H1N1 flu deaths on its Web page. These fatal cases are an under-representation of the actual numbers as many deaths are never tested or recognized as influenza related.

In the tropical regions, 2009 H1N1 is still actively circulating, though at low levels.  Seasonal influenza A (H3N2) and B viruses are being detected in tropical South America and parts of East Africa. In the temperate Northern Hemisphere, 2009 H1N1 viruses are circulating at very low levels. In the temperate Southern Hemisphere, only Chile and Uruguay are reporting notable 2009 H1N1 detections; 11 of 25 samples in Uruguay in the last week of May tested positive for 2009 H1N1.

Selected Highlights

  • According to WHO, the majority of 2009 H1N1 virus isolates tested worldwide remains sensitive to oseltamivir, an antiviral medicine used to treat flu. Among 2009 H1N1 isolates tested worldwide, 298 have been found to be resistant to oseltamivir – as of May 28, 2010, 67 of these isolates were detected in the United States. Approximately 1% of U.S. 2009 H1N1 viruses tested by CDC since September 1, 2009, have been resistant to oseltamivir.
  • Influenza B was reported as the predominating influenza virus accounting for 70.9% of all influenza detections in Hong Kong SAR, 96.1% in the Russian Federation, and 100% in the Ukraine.   
  • On February 18, 2010, WHO published recommendations for the following viruses to be used for influenza vaccines in the 2010-2011 influenza season of the Northern Hemisphere:
    • an A/California/7/2009 (H1N1)-like virus;
    • an A/Perth/16/2009 (H3N2)-like virus*;
    • a B/Brisbane/60/2008-like virus.

* A/Wisconsin/15/2009 is an A/Perth/16/2009 (H3N2)-like virus and is a 2010 Southern Hemisphere vaccine virus.

Health Organizations

World Health Organization (WHO) Regional Offices

Travel and 2009 H1N1 Flu

Human cases of 2009 H1N1 flu virus infection have been identified in the United States and several countries around the world. For information on 2009 H1N1 flu and travel, see the CDC H1N1 Flu and Travel website.

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