Key result
Among 86 pet cats with upper respiratory symptoms in Nanjing, 41.86% tested positive for feline calicivirus, with FCV I identified as the most prevalent genotype.
Why the study?
Despite widespread feline calicivirus vaccination, an explanation for vaccination failure and further studies on virus prevalence were needed in China.
Cross-Sectional (n=86)
Yes
FCV I genotype is the most prevalent in Nanjing, with amino acid variations in the VP1 gene compared to vaccine strains, potentially explaining vaccination failures.
Prevalent FCV I with VP1 variations may underlie vaccination failures; hypothesis-generating for updated feline vaccines and surveillance.
Feline calicivirus (FCV) is a common and important pathogen in cats, typically resulting in upper respiratory tract disease or ulcerative oral lesions. Although there are large number of researches on FCV and vaccines against FCV have been widely used for years, the explanation for vaccination failure and further studies on the prevalence of FCV are still necessary in China. In this study, 86 nasopharyngeal swabs from pet cats with upper respiratory symptoms from several Nanjing animal hospitals were collected in 2020. Among them, 36 (41.86%) were positive for FCV. In addition, 13 FCV capsid genes were sequenced. The comparative analysis of linear B-cell epitopes of VP1 gene indicated that there were many amino acid variations existed among FCV vaccine strains and these strains currently circulating in Nanjing, which may relate to the failure of vaccination and maybe aid for future vaccine design. Besides, phylogenetic analysis of capsid gene revealed two genotypes. Except for the F86 strain, most of the strains were clustered with FCV I genotype, which indicated that FCV I genotype was the most prevalent genotype currently circulating in Nanjing. In conclusion, this study provided useful information as to the evolution and genetic variants of FCV in Nanjing, which is urgent for the future instructions of effective disease prevention and control strategies.
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Liang et al. (2022) conducted a cross-sectional in Feline calicivirus (FCV) infection (n=86). Feline calicivirus (FCV) was evaluated on FCV positivity. Among 86 pet cats with upper respiratory symptoms in Nanjing, 41.86% tested positive for feline calicivirus, with FCV I identified as the most prevalent genotype.
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