martes, 13 de octubre de 2009

2009 H1N1 Flu: International Situation Update



2009 H1N1 Flu: International Situation Update
October 09, 2009, 3:00 PM ET

This report provides an update to the international situation as of October 9, 2009. The World Health Organization (WHO) continues to report updated 2009 H1N1 flu-associated laboratory-confirmed cases and deaths on its Web page. These 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. Over half of influenza specimens reported to WHO worldwide since April 19, 2009, are 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, and parts of Mexico and Canada. In Europe and Central and Western Asia, overall influenza activity remains low, but an increase in activity has been noted in a number of countries and continues to intensify in others.


Selected Highlights

The 2009 H1N1 influenza virus is the predominant influenza virus in circulation 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.
According to WHO, the majority of 2009 H1N1 influenza isolates tested worldwide remain sensitive to oseltamivir, an antiviral medicine used to treat influenza disease. Only 31 2009 H1N1 isolates tested worldwide have been found to be resistant to oseltamivir – 12 of these isolates were detected in the United States.
On September 17, 2009, several countries including the United States announced plans to donate 2009 H1N1 vaccine or funds to support vaccination campaigns in less developed countries.

abrir aquí para acceder al documento WHO completo:
http://www.cdc.gov/h1n1flu/updates/international/

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