ArticleArchives of virology2026
Detection of feline kobuvirus in filtered fecal inocula and molecular epidemiological characterization of feline kobuvirus in Japan.
Article in Archives of virology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Feline kobuvirus (FKoV) is an enteric virus detected in cats in several countries, but its prevalence and genomic characteristics in Japan remain unclear. Here, we report the detection of FKoV in specific-pathogen-free (SPF) cats inoculated with filtered fecal material that had tested negative for FKoV by an initial RT-PCR assay. The inoculum was derived from a shelter-housed cat positive for a feline norovirus (FNoV) strain (KU22; GVI.1; GenBank accession no. LC935948), which shared 99% VP1 nucleotide identity with the Japanese strain M49-1. FKoV RNA was undetectable in all four inoculated cats at day 0 using a degenerate universal kobuvirus primer set, but was detected in all four cats at days 5, 20, and 30 post inoculation. FKoV RNA in the inoculum was negative by the initial RT-PCR assay but positive by the degenerate universal kobuvirus primer set, indicating that FKoV was present in the inoculum but was missed by the initial assay; FKoV RNA was subsequently detected in the inoculated cats, consistent with inoculum-associated introduction of FKoV. Near-complete genome sequencing confirmed that the Japanese strain belonged to the feline kobuvirus lineage, representing the first near-complete FKoV genome sequence from Japan. In a field survey of 83 domestic cats, FKoV RNA was detected in 10 samples (12.0%), with higher prevalence in cats with gastroenteritis than in apparently healthy cats (40.0% vs. 8.2%; Bonferroni-adjusted p = 0.049), and exclusively in cats younger than 1 year. These findings provide genomic and epidemiological data on FKoV in Japan and highlight the need for broad-spectrum screening of biological inocula used in experimental infection studies.
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