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FDA has approved the first human vaccine in the U.S. to be used against the H5N1 influenza virus, commonly referred to as avian flu or bird flu. The vaccine is made by sanofi pasteur Inc. If an avian flu pandemic emerges, the vaccine could provide early, limited protection in the months before a vaccine tailored to the virus is developed. Testing has shown that about 45% of people who received this vaccine produced levels of antibodies expected to reduce the risk of getting the H5N1 flu. The vaccine is indicated for those who could be at increased risk of exposure to the H5N1 influenza virus contained in the vaccine. However, it will not be available commercially, but will be placed in the National Stockpile for future use if needed.

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