Influenza A virus with the antigenic formulae Hav4Neq2 has been isolated from Chlidonias nigra in the region of mass moulting in the territory of the Kazakh SSR. Antihemagglutinins for the newly isolated virus were detected in the sera of some specimens of the sea gull order. The data obtained suggest an active circulation of the virus in this region during the summer of 1977.
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