Bird flu, also called avian influenza ... 40% of people who are hospitalized with the virus. H9 strains. The H9N2 strain has mainly affected children and caused mild upper respiratory tract ...
Bird flu infections are rare in people ... 1999 – Two children in Hong Kong are infected by the H9N2 strain. February ...
Avian influenza, also called avian flu or bird flu, is an illness that usually affects only birds. There are many different ...
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