Avian Bird Flu Update. Highly pathogenic avian influenza virus a(h5n1), the virus at the center of this outbreak, first was identified in the 1990s. Over the last three years, a highly contagious, often deadly form of bird flu has taken a staggering toll on animals around the globe.
In the united kingdom, the following number of cases of. Highly pathogenic avian influenza virus a(h5n1), the virus at the center of this outbreak, first was identified in the 1990s.