Figure 4From: Anti-idiotypic antibodies reduce efficacy of the attenuated vaccine against highly pathogenic PRRSV challengeSerum levels of cytokines. Serum concentrations of IFN-γ (A), IL-2 (B), IL-4 (C) and IL-10 (D) were measured using the commercial ELISA kits (Market Inc, USA). Each point represents the mean value (±S.D) generated from six groups of piglets on different DPIs or DPCs.Back to article page