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Porcine circovirus type 2 (PCV2), an economically important pathogen of swine, is the necessary cause of post weaning multisystemic wasting disease (PMWS); PCV2 infection is associated with porcine dermatitis and nephritis syndrome (PDNS). Current immunohistochemical (IHC) methodologies identify PCV2 antigens but are not capable of differentiating replicating virus from nonreplicating virion particles in tissue sections. In this paper, a combination of IHC using commercial monoclonal antibodies specific for single stranded (ss) and double stranded (ds) DNA and PCV2 specific in situ hybridization (ISH) was used to show the specificity of the former for PCV2 DNA in tissue sections from PCV2-infected gnotobiotic pigs. Cold-ethanol-fixed tissue sections were superior to formalin-fixed tissues for detection of PCV2 DNA, presumably due to the lack of protein cross-linking in the latter. These data demonstrate that conventional IHC detects PCV2 DNA forms in experimentally infected PCV2-positive gnotobiotic porcine tissue sections that are minimally compromised by either formalin fixation or the hybridization conditions needed for ISH.

journal of veterinary diagnostic investigation

A Novel Method for the Detection of Porcine Circovirus Type 2 Replicative Double Stranded Viral DNA and Nonreplicative Single Stranded Viral DNA in Tissue Sections