Canine distemper virus from diseased large felids: biological properties and phylogenetic relationships

The Journal of General Virology
T C HarderA D Osterhaus

Abstract

Specific pathogen free (SPF) domestic cats were inoculated with tissue homogenate obtained from a Chinese leopard (Panthera pardus japonensis) that had died in a North American zoo from a natural infection with canine distemper virus (CDV). The cats developed a transient cell-associated CDV viraemia along with pronounced lymphopenia but did not show any clinical symptoms. Plasma neutralizing-antibody titres against the homologous CDV (A92-27/4, isolated from the Chinese leopard) were consistently higher than against the CDV vaccine strain 'Bussell'. The Chinese leopard CDV isolate showed in vitro biological properties reminiscent of virulent, wild-type CDV strains. Sequence analysis of the H gene of two large felid CDV isolates from the USA (A92-27/4 and A92-6) revealed up to 10% amino acid changes including up to four additional potential N-linked glycosylation sites in the extra-cytoplasmic domain as compared to CDV vaccine strains. Phylogenetic analysis was performed using the entire coding region of the H gene and a 388 bp fragment of the P gene of several morbillivirus species. Evidence was obtained that recent CDV isolates from different species in the United States (including isolates from large felids), Europe and Afric...Continue Reading

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