Canine parvovirus type 2c is the dominant variant circulating in Jilin
Province, Northeast China
Abstract
To understand the current situation of canine parvovirus (CPV) epidemic
strains in Jilin Province and to analyze the molecular biological
characteristics and genetic evolution of the epidemic strains, 44 fecal
or intestinal tissue samples detected by canine parvovirus test strips
in Changchun and Liaoyuan City, Jilin Province, from February 2018 to
November 2019 were collected for cloning, sequencing and genetic
evolution analysis of the gene encoding the virus structural protein
VP2. The results showed that 44 of the 44 samples were CPV-2 positive by
PCR, among which CPV-2c was the dominant variant (70.4%). In addition,
new-CPV-2a (18.2%), new-CPV-2b (9.1%) and CPV-2 (2.3%) also existed.
This is the highest frequency of CPV-2c subtypes observed in canine
populations in Jilin Province so far. In addition to the substitutions
of Ala5Gly, Phe267Tyr, Tyr324Ile, and Gln370Arg in the VP2 protein, a
novel variant with an Arg481Lys mutation was observed in a CPV-2c
strain. Hence, there is a subsequent need for further and extensive
epidemiological investigation and eventual adaptation of current
vaccines.