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Journal of Veterinary Diagnostic Investigation, Vol 13, Issue 1, 57-62
Copyright © 2001 by American Association of Veterinary Laboratory Diagnosticians

Articles

Tissue distribution and genetic typing of porcine circoviruses in pigs with naturally occurring congenital tremors

GW Stevenson, M Kiupel, SK Mittal, J Choi, KS Latimer, and CL Kanitz

Department of Veterinary Pathobiology, Purdue University, West Lafayette, IN 47907, USA.

Congenital tremors (CT) type A2 is associated with porcine circovirus (PCV) and deficient and abnormal myelin. The aim of this study was to determine the tissue distribution and genetic type of PCV in 1-2-day-old pigs with naturally occurring CT type A2 using in situ hybridization, polymerase chain reaction (PCR), and indirect fluorescent antibody tests on frozen tissue sections. CT-affected and clinically normal pigs were selected from 4 farms in the midwestern USA that were undergoing outbreaks of CT type A2. All CT and most normal pigs were infected with PCV. PCV was widely distributed in tissues of infected pigs and was most common in tissues of the central nervous system and liver. In all infected pigs, there were more PCV-infected cells in brain and spinal cord than in nonneural tissues. CT pigs had many more PCV-infected cells in the brain and spinal cord than did clinically normal pigs because of a more diffuse distribution and a larger proportion of infected cells. The cells most commonly infected with PCV in brain and spinal cord were large neurons. In nonneural tissues, macrophages were the most frequent cell type infected. PCR analysis demonstrated only PCV type 2 and not PCV type 1 in all PCV-infected pigs on all 4 farms.


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