%0 Journal Article %A Kendal, A. P. %A Madeley, C. R. %A Allan, W. H. %T Antigenic Relationships in Avian Influenza A Viruses: Identification of Two Viruses Isolated from Turkeys in Great Britain during 1969ā€“1970 %D 1971 %J Journal of General Virology, %V 13 %N 1 %P 95-100 %@ 1465-2099 %R https://doi.org/10.1099/0022-1317-13-1-95 %I Microbiology Society, %X SUMMARY The neuraminidase (E.C. 3.2.1.18) of A/turkey/england/69 is related antigenically to the neuraminidases of A/turkey/massachusetts/65 and A/turkey/england/66 avian influenza viruses, and to an A 2/1957 human influenza virus. The neuraminidase of A/turkey/scotland/70 is related antigenically to the neuraminidases of A/dutch and virus ā€˜Nā€™ (isolated before 1930 and in 1949 respectively), thus demonstrating the recurrence of a neuraminidase antigen in avian influenza A viruses over a period of at least 40 years. The haemagglutinins of A/turkey/england/69 and A/turkey/scotland/70 did not cross-react specifically with each other, or with viruses representing four known avian influenza A haemagglutinin prototypes. %U https://www.microbiologyresearch.org/content/journal/jgv/10.1099/0022-1317-13-1-95