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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 ‘N’ (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.
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