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Avian influenza--current evaluation of risks to humans from H5N1 following recent reports.

In the past three weeks, avian influenza appears to have re-emerged in poultry in several countries in Asia. These outbreaks could either be new outbreaks of highly pathogenic avian influenza A(H5N1) virus, or a continuation of the outbreaks first reported earlier in the year. These events, in addition to two new research reports – about the virus becoming increasingly pathogenic and more widespread in birds in the region – fuel the World Health Organization’s concern about the threat that the virus poses to human health.