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Vaccination
Management
Disease Information
A PMWS update (Jake Waddilove)
ABOUT PMWS & PDNS
National Pork Board PMWS Fact Sheet
About PDNS (Jake Waddilive)
CEI Emerging Disease Notices: PMWS / PDNS
Conference and meetings archive
Case Histories
Yorkshire Farm, UK - Mike Muirhead - Final Update, June 2002
Mike Muirhead's case history of a Yorkshire farm with PMWS and PDNS.
East Anglia Farm, UK - Philip Richardson
This paper charts the course and effects of the disease on a single herd as well as highlighting the economic impact.
Photographs
Clinical signs
Photos of the clinical signs that are seen generally in pigs with PMWS and PDNS. Includes skin lesions, enlarged lymph glands, wasting and dead pigs.
Post mortem (1)
Photos of the signs that are seen in post-mortem samples of pigs with PMWS and PDNS. Includes interstitial pneumonia, secondary bacterial infection, enlarged lymph nodes, oedema and intra cytoplasmic inclusions
Post mortem (2)
More Photos of the signs that are seen in post-mortem samples of pigs with PMWS and PDNS.


PMWS Research Archives

Published Wednesday, November 05, 2008: Vet Microbiol. 2008 Nov 5
A New Emerging Genotype Subgroup within PCV-2b Dominates the PMWS Epizooty in Switzerland.
Wiederkehr DD, Sydler T, Buergi E, Haessig M, Zimmermann D, Pospischil A, Brugnera E, Sidler X.
Postweaning multisystemic wasting syndrome (PMWS) is among the most important emerging pig diseases worldwide. Initially, the insidious nature of the disease made it difficult to pinpoint the pathogen. The presence of porcine circovirus type 2 (PCV2) in all PMWS diseased animals led to its acceptance, possibly together with an unknown factor, as the causative agent for PMWS. Also, presence of PCV2 in healthy individuals did not facilitate the understanding of the disease. Phylogenetic classification separates PCV2 viruses into at least two major groups. With the aid of a signature motif, a short amino acid motif encoded within the capsid protein, the viruses are determined as belonging to PCV-2a or PCV-2b. Recently, this classification received more attention, as it seemed to define PCV-2b to be more virulent. This simplification, however, could not be confirmed experimentally. Hence, we investigated whether virus genetic shift was an initiator for the PMWS epizooty in Switzerland. Piglet lymphoid tissues from 1973 to 2005 were investigated by histology, immunohistochemistry (IHC) and PCR. For genotype classification, a sequence amplificate of 137bp was used encompassing the signature motif. The onset of Swiss PMWS epizooty exhibited a marked shift in PMWS diseased and subclinically infected piglets to PCV-2b and specifically to one genotype subgroup. Complementary to these observations, healthy piglets also defined by IHC as negative are positive in the PCR reaction and are void of any PCV-2b virus during epizooty. Consequently, our data support PCV2 genome plasticity as a major contributing factor for PMWS disease manifestation.

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