An influenza infection in birds gives a good protection against other subtypes of the virus, like a natural vaccination, according to a new study.
Water birds, in particular mallards, are often carriers of low-pathogenic influenza A virus. Researchers previously believed that birds infected by one variant of the virus could not benefit from it by building up immunity against other virus subtypes. However, the recent study concludes that mallards infected with a low-pathogenic virus bu
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