Application of a protocol for the diagnosis of postweaning multisystemic wasting syndrome in Italy

Samples of superficial inguinal and bronchial lymph nodes, ileum, tonsil and lung were taken from three to five pigs on each of 61 farms with a clinical history of postweaning multisystemic wasting syndrome (PMWS). The samples were examined histologically and by immunohistochemistry for porcine circ...

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Bibliographic Details
Published in:Veterinary record 2009-04, Vol.164 (17), p.519-523
Main Authors: Sarli, G., Ostanello, F., Morandi, F., Fusaro, L., Gnudi, M., Bacci, B., Nigrelli, A., Alborali, L., Dottori, M., Vezzoli, F., Barigazzi, G., Fiorentini, L., Sala, V., Leotti, G., Joisel, F.
Format: Article
Language:English
Subjects:
Animals
Antibodies
Cytoplasm
Dendritic cells
disease diagnosis
Histology
Hogs
Hyperplasia
Immunohistochemistry - veterinary
Infections
Inflammation
Italy - epidemiology
Lungs
Lymphatic system
Lymphoid Tissue - virology
Mortality
Pneumonia
Porcine Postweaning Multisystemic Wasting Syndrome - diagnosis
Porcine Postweaning Multisystemic Wasting Syndrome - epidemiology
postweaning multisystemic wasting syndrome
Practice Guidelines as Topic
Questionnaires
Serology
Small intestine
Swine
Viruses
Weaning
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Summary:Samples of superficial inguinal and bronchial lymph nodes, ileum, tonsil and lung were taken from three to five pigs on each of 61 farms with a clinical history of postweaning multisystemic wasting syndrome (PMWS). The samples were examined histologically and by immunohistochemistry for porcine circovirus type 2 (PCV-2). PMWS was diagnosed in two stages: first, an evaluation of the haematoxylin and eosinstained sections that identified the cases in which the characteristic PCV-2 cytoplasmic inclusion bodies were apparent, and secondly, a conclusive step in which immunohistochemistry was applied to confirm PMWS in the cases in which there were positive immunohistochemical results that coincided with lesions indicative of PMWS in at least one of the lymphoid and/or lung tissues. The location of PCV-2 in specific lesions (cell depletion in lymphoid organs and interstitial pneumonia) confirmed PMWS in 45 of the 61 farms, 31 of which were also infected with porcine reproductive and respiratory syndrome virus. The lymphoid tissues were more reliable than the lungs for the diagnosis of PMWS, both in individual pigs and in groups of pigs, and farm diagnoses based on a group of pigs were more reliable than diagnoses based on single pigs.
ISSN:0042-4900
2042-7670
DOI:10.1136/vr.164.17.519