Avian influenza viruses have been isolated in Great Britain in recent years from our sources: 1. (1) Dead birds arriving at Heathrow (London) Airport Between 1976 and 1978 62 influenza viruses were isolated, 48 of Hav7 Neq2 subtype and 14 of Hav4 (all those tested are Nav1) subtype. 2. (2) Birds held in quarantine Between March 1976 and February 1979 30 influenza A viruses were isolated from this source. Eight had Hav7Neq2 antigens, 21 Hav4 (all those tested Nav1) and one Hav2Neq1 antigens. 3. (3) Domestic poultry During 1963-1978 seven influenza isolations were made from turkeys: A/ty/England/63(Hav1 Nav3), A/ty/England/66(Hav6 N2), A/ty/England/69(Hav7/H3 N2), A/ty/Scotland/70(Hav? Neq1), A/ty/England/N28/73 (Hav5 N2), A/ty/England/110/77 (Hav6 N2), A/ty/England/647/77(Hav1 Neq1). In the early Spring of 1979 several outbreaks of influenza infections occurred on turkey farms in Norfolk. Virus isolates were predominantly of Hav1 subtype in combination with Nav2, N2 and Ne1 1 but a virus of Hsw1 N1 subtype was also isolated from turkeys. The Hav1Neq1 isolates were virulent for chickens and turkeys. 4. (4) Wild birds An influenza virus of Hav6 Neq2 subtype was isolated from a Canada goose. © 1980.
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