title: Isolation of influenza a viruses from commercial ducks on a farm in Norfolk between August 1979 and March 1980.
abstract: Investigation of respiratory disease and high mortality which occurred on a commercial duck fattening farm between August 1979 and March 1980 resulted in the isolation of 10 influenza A viruses. The viruses were characterised as Hav6 N2 (three isolates), Hav4 Navl (four isolates), Hav4 Nl (two isolates) and Hav7 Neq2 (one isolate) subtypes by haemagglutination-inhibition and neuraminidase-inhibition tests. A Newcastle disease virus isolate was also obtained from the ducks. All isolates had low intravenous pathogenicity indices in 6-week-old chickens.
authors.affiliation: Poultry Department, Central Veterinary Laboratory, New Haw, Weybridge, Surrey, England.
authors.forename: D J
authors.initials: DJ
authors.lastname: Alexander
authors.forename: D
authors.initials: D
authors.lastname: Spackman
authors.forename: R E
authors.initials: RE
authors.lastname: Gough
authors.forename: E D
authors.initials: ED
authors.lastname: Borland
authors.forename: J C
authors.initials: JC
authors.lastname: Stuart