Abstract
We have previously found (O. Nakagomi, T. Nakagomi, H. Oyamada, and T. Suto, J. Med. Virol. 17:29-34, 1985), during an epidemiological study in Japan, a novel human rotavirus that belongs to subgroup I but has a long RNA pattern typical of subgroup II human rotaviruses. From the stool specimen containing this virus, we successfully isolated in MA104 cells a rotavirus, designated AU-1, which possesses these novel characteristics. The possibility that strain AU-1 was a laboratory contaminant of an animal rotavirus previously adapted to tissue culture cells was ruled out, and the identity of the AU-1 strain was established. Genetic analysis by RNA-RNA hybridization revealed that the AU-1 strain is not a simple reassortant between subgroup I and II human rotaviruses but that it shares a high level of sequence homology only with the gene encoding VP7 (the major neutralization protein) of serotype 3 human rotaviruses. Weak homology of the genomic RNA segments was also observed between the AU-1 strain and animal rotavirus strains, including rhesus rotavirus strain RRV and bovine rotavirus strain NCDV. These results suggest that the AU-1 strain may be an animal rotavirus that infected a human.
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