Highly pathogenic avian influenza viruses with low virulence for chickens inin vivotests

Abstract
International audienceFour avian influenza viruses have been recognised that have genetic coding for HPAI viruses, but do not show virulence for chickens. The different mechanisms that prevent this potential being expressed have been determined for A/chicken/Pennsylvania/1/83 (H5N2) and A/goose/Guandong/2/96 (H5N1), but neither of these apply to A/turkey/England/87-92BFC-LDP3/91 (H5N1) or A/chicken/Texas/298313/04 (H5N2)