Parvovirus is the most common viral cause of diarrhea in young puppies. Based on the analysis of a partial VP2 sequence of 54 samples, canine parvovirus type 2c (CPV-2c) (n = 26), CPV-2b (n = 25), and CPV-2 (n = 3) were detected in the United States. The American CPV-2b isolates have unique codons (494 and 572) in VP2.
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