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Department of Bacteriology, Yamagata University School of Medicine, Iida-Nishi, Yamagata 990-23, Japan
We reported previously that the antigenicity of the haemagglutinin-esterase (HE) glycoprotein of the human influenza C virus strain C/Nara/1/85 was indistinguishable from that of strain C/Nara/82. However, the ribonuclease T1-oligonucleotide map of total virion RNA of C/Nara/1/85 differed remarkably from the map of C/Nara/82, resembling instead the map of C/Nara/2/85, which has an HE antigenicity dissimilar to C/Nara/82 and C/Nara/1/85. This observation raised the possibility that C/Nara/1/85 might have arisen by reassortment from two viruses closely related to C/Nara/82 and C/Nara/2/85, respectively. Here, we compared the total nucleotide sequence of the HE gene and partial sequences of the other genes of C/Nara/1/85 with those of C/Nara/82 and C/Nara/2/85. The results suggest that C/Nara/1/85 has inherited HE and NP genes from a C/Nara/82-related virus and the PB2, PB1, PA, M and NS genes from a C/Nara/2/85-related virus.
Received 3 June 1994;
accepted 8 August 1994.
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