Fig. 3From: 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 Mean values of the M. hyopnuemoniae ELISA antibodies. b Mean values of the PCV2 ELISA antibodies. c Mean values of the PRRSV ELISA antibodies. Variation is expressed as the standard deviation. Different letters within a sampling point mean statistically significant differences (P < 0.05)Back to article page