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Preparing for pandemic influenza
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November 28, 2005
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Description:Three conditions must be met for a pandemic to start: 1) a new influenza virus subtype must emerge; 2) it must infect humans and causes serious illness; and 3) it must spread easily and sustainedly (continue without interruption) among humans. The H5N1 virus in Asia and Europe meets the first two conditions: it is a new virus for humans (H5N1 viruses have never circulated widely among people), and it has infected more than 100 humans, killing over half of them.
CDC%20Preparing%20for%20Pandemic%20Influenza%20Fact%20Sheet.pdf
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