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Why is there concern about the H5N1 avian influenza outbreak in Asia and other countries?

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Why is there concern about the H5N1 avian influenza outbreak in Asia and other countries?

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A. Although it is unpredictable when the next pandemic will occur, and what strain of flu virus will cause it, the continued and expanded spread of a severe form of avian influenza in birds across eastern Asia and into a few countries in Europe represents a significant threat. This bird flu virus, known as highly pathogenic “H5N1,” has raised concerns about a potential human pandemic because: • This H5N1 virus is widespread and persistent in poultry in many countries in Asia and has spread to birds in several countries in Europe; • The virus has been transmitted from birds to a few species of mammals and in some limited circumstances to humans; • Among humans known to have become infected with the avian H5N1 virus, many have developed serious illness and approximately 50 percent have died; • Wild birds and domestic ducks have been infected without showing symptoms and have become carriers of viral infection to other domestic poultry species; • Although most humans who were infected wit

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