Avian influenza virus from the ongoing outbreak in dairy cattle appears to be keeping its bird-infecting features rather than ...

Studies suggest that people who had seasonal flus or vaccinations have low antibody levels against H5N1 bird flu.

Preexisting immunity to the 2009 H1N1 influenza virus provided near-complete protection against severe H5N1 disease and ...

The H5N1 bird flu virus has historically extracted a heavy toll when it infects humans, with nearly half of confirmed cases ...

The fatality rate for H5N1 highly pathogenic avian influenza in humans has historically been high, with more than half of ...