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Canine kobuviruses (CaKVs) are newly recognized picornaviruses that have been recently detected in dogs in the U.S.A., Italy, U.K., the Republic of Korea and Tanzania. To trace the evolution of CaKV strains, a total of 201 fecal samples from rectal swabs of diarrheic dogs, which were obtained from May 2014 to April 2015 in northeast China, were detected by reverse transcription-PCR targeting a partial (504 bp) fragment of the 3D gene. Furthermore, a phylogenetic analysis of the CaKV strains identified in northeast China was conducted based on the partial 3D gene sequence. The results indicated that 36 fecal samples (17.91%, 36/201) were positive for CaKV, in which the co-infection rates of canine coronavirus, canine parvovirus-2 and canine bocavirus were 58.33%, 41.67%, and 11.11%, respectively. Sequence comparison of the partial 3D gene revealed nucleotide homologies of 94.4-100%, 95.6-98.6%, 94.3-97.6%, 94.4-96.3% and 93.3-95.1% within the 36 Chinese CaKV strains, and between the 36 Chinese CaKV strains and four CaKV reference strains from South Korea, Italy, U.S.A. and Tanzania, respectively. A phylogenetic tree revealed that the 36 Chinese CaKV strains formed one specific CaKV lineage with CaKVs that have recently been identified in other countries. The 36 Chinese CaKV strains were closely related to CaKV reference strains from Asia and Europe, but differed genetically from CaKV reference strains from North America and Africa. This study provides evidence that CaKVs circulate in diarrhoetic dogs in China and that they exhibit substantial genetic diversity and high co-infection rates with other enteric viruses.

Prevalence and phylogenetic analysis of canine kobuviruses in diarrhoetic dogs in northeast China