90% of bird flu cases hit people under age 40

Viral News: Bird Flu

Feb 10, 2007

Nearly 90 per cent of the people who have been diagnosed so far with H5N1 strain of the avian flu virus were under age 40, a new analysis from the World Health Organization shows. That as-yet-unexplained phenomenon could be a clue that widespread immunity to infection by the virus may exist in people aged 35 and older.

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