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If bird flu sparks a human pandemic, your past immunity could help. Older populations might be more protected than younger ones because of exposure to ‘matched’ strains during childhood, but an H5N1 pandemic is likely to take a major toll all the same.

Older populations might be more protected than younger ones because of exposure to ‘matched’ strains during childhood, but an H5N1 pandemic is likely to take a major toll all the same.

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