Prevalence of porcine circovirus types 2a and b in pigs with and without post-weaning multi-systemic wasting syndrome

Abstract The objective of this study was to determine the prevalence of porcine circovirus (PCV) type 2 genotypes in pigs with post-weaning multi-systemic wasting syndrome (PMWS) and in pigs that that did not have the disease. Nested PCR was used to analyse tissue from 540 formalin-fixed, paraffin-embedded lymph nodes. The number of PCV2a-positive pigs that had ( χ trend 2 = 54.584 , P χ trend 2 = 70.066 , P χ trend 2 = 31.356 , P χ trend 2 = 9.494 , P