Fig. 4From: Evaluation of the efficacy of a trivalent vaccine mixture against a triple challenge with Mycoplasma hyopneumoniae, PCV2, and PRRSV and the efficacy comparison of the respective monovalent vaccines against a single challengea Frequency of M. hyopneumoniae-specific IFN-γ-SC/106 PBMC. b Frequency of PCV2-specific IFN-γ-SC/106 PBMC. c Frequency of PRRSV-specific IFN-γ-SC/106 PBMC. Variation is expressed as the standard deviation. Different letters within a sampling point mean statistically significant differences (P < 0.05)Back to article page