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Reported global distribution for influenza A(H9N2) in humans and animals from 1997 to 2013. Countries that detected influenza A(H9N2) in poultry have an orange background. Species-specific symbols were assigned to each country. When a human or animal was found to be seropositive for influenza A(H9N2), the species was colored green; if a virological sample from humans or animals tested positive, the species was colored red.
