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Naturally Occurring Temperature-sensitive Influenza A Viruses of the H1N1 and H3N2 Subtypes

National Institute for Biological Standards and Control, Holly Hill Hampstead, London NW3 6RB, U.K.

Seventeen of twenty-six influenza A virus isolates of the H1N1 antigenic subtype and two of eleven H3N2 virus isolates from the 1977–78 season exhibited a ts phenotype, were restricted in plaquing in MDCK cells at 38.5 °C compared to 34 °C and appeared to be naturally occurring ts mutants. The cut-off temperature for two such ts H1N1 virus isolates was established as 38 °C. The ts viruses were as thermostable as non-ts isolates and no complementation was detected between the twelve ts viruses tested. Cloning studies with an H1N1 virus isolate with minimal ts properties indicated the presence of a mixed population of ts⁺ and ts particles. Analysis of seven recombinants of A/HK/117/77 (N1N1) virus indicated that the ts lesion(s) was not located in the NA or HA proteins.

Received 4 May 1979; accepted 19 December 1979.

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