An avian influenza virus of type H5N1 has recently evolved a “high pathogenicity” (hp) strain that causes severe illness in most wild birds (except ducks) as well as in domestic poultry. A few humans have been infected. The World Health Organization (WHO) currently inspects every human case with particular attention to how the patients contracted the virus. Why is this virus a cause for concern, and why are WHO officials so interested in each patient’s source of infection?
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