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Impact of immunizations with porcine reproductive and respiratory syndrome virus on lymphoproliferative recall responses of CD8+ T cells.

Abstract：

:The objective of this study was to investigate the immune responses elicited by either a modified-live (MLV) or a killed virus (KV) porcine reproductive and respiratory syndrome virus (PRRSV) vaccine. Specifically, we investigated the effects of multiple vaccinations on antigen-specific cellular and antibody responses against PRRSV. Twelve sows were obtained from herds with either a history of repeated MLV or KV PRRSV vaccination and a non-vaccinated, PRRSV-negative herd. Within herd, sows were divided into three groups and vaccinated with MLV, KV, or injected with saline. On day 0, 27, and 38, recall responses of peripheral blood mononuclear cells (PBMC) to the parent strains of the vaccines (e.g., MLV-VR2332 or KV-ISUP) were examined. The concentrations of total PRRSV-specific and virus-neutralizing serum antibodies were determined by ELISA and serum neutralization assays. Following immunization, the antigen-specific proliferation of CD8alphabeta(+), CD4(+)CD8alphaalpha(+) T cells in the naive sows was greater than in sows repeatedly vaccinated with KV or MLV. This diminished lymphoproliferative responses of CD8alphabeta(+) and CD4(+)CD8alphaalpha(+) T cells could be partially overcome by heterologous immunization. However, B cell proliferation, PRRSV antibody concentrations and virus neutralizing antibody titers were not enhanced by heterologous immunization and only KV vaccination increased antibody levels in previously immunized (MLV or KV) sows.

journal_name

Viral Immunol

journal_title

Viral immunology

authors

Bassaganya-Riera J,Thacker BJ,Yu S,Strait E,Wannemuehler MJ,Thacker EL

doi

10.1089/088282404322875430

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

25-37

issue

1

eissn

0882-8245

issn

1557-8976

journal_volume

17

pub_type

杂志文章

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