| Abstract: | The infection status of 15 viruses in 120 pigs aged about 6 months was investigated basedon tonsil specimens collected from a slaughterhouse. Only 5 species of porcineparvoviruses and porcine circovirus type 2 (PCV2) were detected at high frequencies; 67%for porcine parvovirus (PPV) (PPV-Kr or -NADL2 as the new abbreviation), 58% for PPV2(CnP-PARV4), 39% for PPV3 (P-PARV4), 33% for PPV4 (PPV4), 55% for PBo-likeV (PBoV7) and80% for PCV2. A phylogenetic analysis of PPV3 suggested that Japanese PPV3s showed aslight variation, and possibly, there were farms harboring homogeneous or heterogeneousPPV3s. Statistical analyses indicated that the detection of PCV2 was significantlycoincidental with each detection of PPV, PPV2 and PPV3, and PPV and PPV4 were alsocoincidentally detected. The concurrent infection with PCV2 and porcine parvoviruses inthe subclinically infected pigs may resemble the infection status of pigs with theclinical manifestations of porcine circovirus associated disease which occurs in 3–5months old pigs and is thought to be primarily caused by the PCV2 infection. |
