title: Highly pathogenic avian influenza viruses with low virulence for chickens in in vivo tests.
abstract: Four avian influenza viruses have been recognized that have genetic coding for highly pathogenic avian influenza viruses, but do not show virulence for chickens. The two 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 applies to A/turkey/England/87-92BFC/91 (H5N1) or A/chicken/Texas/298313/04 (H5N2).
authors: Virology Department, Veterinary Laboratories Agency Weybridge, New Haw, Addlestone, Surrey, UK.
authors: Brandon Z
authors: BZ
authors: Londt
authors: Jill
authors: J
authors: Banks
authors: Dennis J
authors: DJ
authors: Alexander
mesh_terms: D000818:Animals; D002645:Chickens / Q000821:virology*; D053124:Influenza A Virus, H5N1 Subtype / Q000472:pathogenicity*; D053125:Influenza A Virus, H5N2 Subtype / Q000472:pathogenicity*; D005585:Influenza in Birds / Q000821:virology*; D014774:Virulence