Twenty-seven feline parvovirus (FPV) isolates were recovered from cats clinically diagnosed with feline panleukopenia (FPL) for assessing antigenic and genomic properties of FPL viruses (FPLV) recently prevalent among cats in Japan. All isolates, with the exception of one novel isolate, FPV-314, possessed homologous properties, and their subgroups in FPVs were identified as FPLV. The FPV-314 isolate, which was from a 1.5-yearold cat which manifested clinical signs of FPL and died on the 13th day after the first medical examination, was finally identified as canine parvovirus (CPV) because it lacked a specific antigenic epitope commonly detected in FPLV and mink enteritis virus and because the nucleotide sequence of the capsid protein gene was almost identical to those of CPV-2a and-2b antigenic type strains recently prevalent among dogs in Japan. The present result together with our previous findings (M. Mochizuki, R. Harasawa, and H. Nakatani. Vet. Microbiol. 38:1-10, 1993) indicates the possibility that CPV and FPLV undergo mutual interspecies transmission between dogs and cats, and it is postulated that they may cause disease in some adventitious hosts.

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