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Virology. 2003 Apr 25;309(1):18-31.

Gradual development of the interferon-gamma response of swine to porcine reproductive and respiratory syndrome virus infection or vaccination.

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1
Department of Veterinary Pathobiology, University of Illinois, Urbana, IL 61802-617, USA.

Abstract

Infection of swine with virulent porcine reproductive and respiratory syndrome (PRRS) virus induced a rapid, robust antibody response that comprised predominantly nonneutralizing antibodies and waned after approximately 3 months. In contrast, the initial onset of virus-specific interferon (IFN)-gamma-secreting cells (SC) in the pig lymphocyte population remained at a fairly low level during this period and then increased gradually in frequency, plateauing at 6 months postinfection. A similar polarization of the host humoral and cellular immune responses was also observed in pigs immunized with a PRRS-modified live virus (MLV) vaccine. Even coadministration of an adjuvant that enhanced the immune response to a pseudorabies (PR) MLV vaccine failed to alter the induction of PRRS virus-specific IFN-gamma SC (comprising predominantly CD4/CD8 alpha double positive memory T cells with a minority being typical CD4(-)/CD8 alpha beta(+) T cells) and the generation of neutralizing antibodies. Moreover, unlike inactivated PR virus, nonviable PRRS virus did not elicit virus-neutralizing antibody production. Presumably, an intrinsic property of this pathogen delays the development of the host IFN-gamma response and preferentially stimulates the synthesis of antibodies incapable of neutralization.

PMID:
12726723
DOI:
10.1016/s0042-6822(03)00009-6
[Indexed for MEDLINE]
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