CYP19A1 and common wart: Subsequently, the three-primer combination (CPV1/2L1-F+CPV1L1-R1+CPV2L1-R1) was further utilized to detect individual or simultaneous presence of CPV1 and CPV2 nucleic acids in whole DNAs extracted from 18 clinical canine wart samples (S), either singly or co-infected with CPV1 and/or CPV2 (Figure 3B).