Alphatronlike (genogroup IV [GIV]) noroviruses (NoVs) have been recently identified in carnivores. By screening a collection of 183 fecal samples collected during 2007 from dogs with enteric signs, the overall NoV prevalence was found to be 2.2% (4/183). A unique strain, Bari/91/07/ITA, resembled GIV.2 NoVs in its ORF1 (polymerase complex), while it was genetically unrelated in its full-length ORF2 (capsid gene) to GIV animal and human NoVs (54.0 to 54.4% amino acid identity) and to any other NoV genogroup (<54.7% amino acid identity). It displayed the highest identity (58.1% amino acid identity) to unclassified human strain Chiba/040502/04/Jp. Interestingly, the very 5' end of ORF2 of the canine virus matched short noroviral sequences (88.9% nucleotide identity and 98.9% amino acid identity) identified from oysters in Japan, indicating that similar viruses may be common environmental contaminants.
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