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Virus isolation, polymerase chain reaction (PCR), immunohistochemistry, and in situ hybridization were compared for the detection of porcine circovirus 2 (PCV2) and porcine parvovirus (PPV) from experimentally and naturally coinfected pigs. All coinfected pigs developed postweaning multisystemic wasting syndrome (PMWS), characterized by sudden onset of depression and anorexia. Microscopically, granulomatous inflammation with intracytoplasmic inclusion bodies was present in lymph node from all coinfected pigs at 32 days postinoculation. Of the 200 tissues from 20 experimentally coinfected pigs evaluated, 99 and 58 tissues were positive for PCV2 and PPV, respectively, by 4 techniques. Virus isolation, PCR, immunohistochemistry, and in situ hybridization identified PCV2 infection in 137, 148, 103, and 129 tissues and PPV infection in 107, 132, 59, and 94 tissues. Of the 200 tissues from 20 naturally coinfected pigs evaluated, 109 and 45 tissues were positive for PCV2 and PPV, respectively, by 4 techniques. Virus isolation, PCR, immunohistochemistry, and in situ hybridization identified PCV2 infection in 144, 155, 113, and 139 tissues and PPV infection in 93, 109, 45, and 82 tissues. Because the characteristic microscopic lesions are important criteria for the diagnosis of clinical PMWS, immunohistochemistry and in situ hybridization for the detection of PCV2 and PPV in formalin-fixed, paraffin-embedded tissues provide confirmation of a histopathological diagnosis of PMWS.

journal of veterinary diagnostic investigation

A Comparison of Virus Isolation, Polymerase Chain Reaction, Immunohistochemistry, and in Situ Hybridization for the Detection of Porcine Circovirus 2 and Porcine Parvovirus in Experimentally and Naturally Coinfected Pigs