Avian Influenza — Worldwide/Unknown
Human infection with avian influenza A(H5) viruses
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From 2003 through 1 May 2015, 840 laboratory-confirmed human cases of avian influenza A(H5N1) virus infection have been officially reported to WHO from 16 countries. Of these cases, 447 have died. (The outcomes of previously reported cases have recently been updated by the reporting countries, accounting for the increase in reported fatalities.)
Since the last WHO Influenza update on 31
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