Transient correlation between viremia levels and IL-10 expression in pigs subclinically infected with porcine circovirus type 2 (PCV2)

December 20, 2007 — L. Darwich, J. Segal?s, A. Resendes, M. Balasch, J. Plana-Dur?n and E. Mateu

Immunological impairment by porcine circovirus type 2 (PCV2) infection is well documented in pigs suffering from postweaning multisystemic wasting syndrome. Nonetheless, little is known about immune status of pigs that remain PCV2 subclinically infected. Thus, seven pigs successfully infected in an experimental inoculation and without developing disease and nine control non-inoculated pigs were examined. Serological, virological and immunological determinations were done throughout ten weeks post-infection (PI). At week 3 PI, inoculated animals presented the peak of viremia and produced higher levels of IL-10 than the controls; correlation between viral load and IL-10 amounts was observed (p < 0.05). Also, the ratio IgM/IgG suffered a shift skewing IgM production towards an IgG response. By 10 weeks PI, levels of IL-10 disappeared and the viremia decreased. In summary, subclinically PCV2-infected pigs developed a transient PCV2-specific IL-10 response during the viremic phase of infection which coincided with the inversion of the IgM/IgG ratio.

L. Darwich, J. Segalés, A. Resendes, M. Balasch, J. Plana-Durán and E. Mateu, Transient correlation between viremia levels and IL-10 expression in pigs subclinically infected with porcine circovirus type 2 (PCV2), Research in Veterinary Science, Volume 84, Issue 2, April 2008, Pages 194-198

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L. Darwich^{a, b}, J. Segal?s^{a, b}, A. Resendes^a, M. Balasch^c, J. Plana-Dur?n^c and E. Mateu^{a, b
a}Departament de Sanitat i d?Anatomia Animals, Facultat Veterin?ria, Universitat Aut?noma de Barcelona, 08193 Bellaterra, Spain
^bCentre de Recerca en Sanitat Animal (CReSA), Edifici CReSA, 08193 Bellaterra, Spain
^cFort Dodge Laboratorios, 17813 Vall de Bianya, Girona, Spain