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OJVRTM
Online Journal of Veterinary Research ©
Volume
14 (2): 265-269, 2010. Redacted 2017..
Granulomatosis
of lymphoid tissue in post-weaning multisystemic
wasting syndrome in pigs during epidemic and endemic phases.
Laura Fusaro, Giuseppe Sarli*, Federico Morandi, Barbara Bacci, Fabio
Ostanello, Giorgio Leotti1, Luciana Mandrioli, Paolo Stefano Marcato
Address: Department of
Veterinary Public Health and Animal Pathology, Faculty of Veterinary Medicine,
Bologna University, Italy, 1Merial Italia, Italy, * Corresponding
author.
ABSTRACT
Fusaro
L, Sarli G, Morandi F, Bacci B, Ostanello F, Leotti G, Mandrioli L, Marcato PS, Granulomatosis of lymphoid tissue in post-weaning
multisystemic wasting syndrome in pigs during
epidemic and endemic phases. Onl J Vet Res, 14 (2):
265-269, 2010. Post-weaning
multisystemic wasting syndrome (PMWS) is causally
associated with infection of pigs by Porcine Circovirus type 2 (PCV2). Lesions
in lymphoid tissues of 52 PMWS-positive pigs sampled years 1998-2000 (epidemic)
were compared with lesions from 127 PMWS-positive pigs sampled 2006-2008
(endemic). A variable degree of lymphoid depletion was a constant feature in
tissues with microgranulomas formed by a scant number
of centrofollicular epithelioid cells, or granulomas
clustered in multiple undelimited nodules with little
tendency to confluence, formed by epithelioid macrophages and a few
multinucleate giant cells. Granulomatosis of lymphoid tissues is known in PMWS
of pigs due to type IV hypersensitivity. Granulomatosis of lymphoid tissues was
apparent in 1.07% during the 1998-2000 period and in
12.42% in the more recent period.
Results suggest that frequency of lymphoid granulomatosis is influenced
by the epidemiology of the disease.
Key words: Granulomatosis,
weaning, wasting, pigs, epidemic.
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