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Serum concentrations of gamma interferon (IFN-γ) in pigs post inoculation (PI) with Porcine reproductive and respiratory syndrome virus (PRRSV), strain SDSU-73 (n = 7) or strain JA-142 (n = 6), or after sham inoculation (n = 6). For all 4 figures, all serum samples were analyzed in duplicate for swine IFN-γ with a commercial enzyme-linked immunosorbent assay kit, and the values are means ± the standard error for each group.
