®Avian influenza (AI) is an infectious viral disease of birds
®Some of these AI viruses have been reported to cross the species barrier and cause disease or subclinical infections in humans and other mammals.
® Avain virus subtype (H5N1) is a highly pathogenic AI virus, re-emergence occur in 2003 and 2004.
®The case fatality rate for H5N1 infections in people is much higher compared to that of seasonal influenza infections.