CDC 2009 H1N1 Flu | 2009 H1N1 Flu: International Situation Update

2009 H1N1 Flu: International Situation Update
September 25, 2009, 11:00 AM ET

This report provides an update to the international situation as of September 25, 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 more than 431 deaths since September 13th. 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 largely declining. In tropical regions, there is still substantial disease due to 2009 H1N1. In temperate regions of the Northern Hemisphere, there is increased influenza like illness (ILI) activity due to 2009 H1N1, including in most of the United States, parts of Mexico and some countries in Europe.

Selected Highlights
The 2009 H1N1 influenza virus is the predominant influenza virus in circulation worldwide in most countries worldwide.
The epidemiology of disease caused by 2009 H1N1 influenza in the Southern Hemisphere is very similar to that described in the United States in the spring of 2009.
There have been no significant changes detected in the 2009 H1N1 influenza viruses isolated from persons in the Southern Hemisphere as compared to viruses isolated from persons in the Northern Hemisphere.
In August, a White House report was prepared by the Department of Health and Human Services (HHS) in coordination with the Office of the Director for National Intelligence (ODNI) and the Department of State (DoS) and describes the characteristics and impact of 2009 H1N1 influenza A virus in the Southern Hemisphere. The full report can be accessed by the link provided in the Reports and Publications section below.
As of September 25, 2009, WHO reported that more than 10,000 2009 H1N1 influenza isolates worldwide were tested and found to be sensitive to oseltamivir, an antiviral medicine used to treat influenza disease. Only 28 2009 H1N1 isolates tested have been found to be resistant to oseltamivir – 11 of these isolates were detected in the United States.
On September 18, 2009, the United States, together with Australia, Brazil, France, Italy, New Zealand, Norway, Switzerland and the United Kingdom, announced plans to donate pandemic vaccine to the developing world.
International Resources for 2009 H1N1 Information
Health Organizations
World Health Organization (WHO)
ECDC (European Centre for Disease Prevention and Control)
H2P (Humanitarian Pandemic Preparedness)
Public Health Agency of Canada

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CDC 2009 H1N1 Flu | 2009 H1N1 Flu: International Situation Update