Figure 1

The antibody response to P. multocida and body temperature in piglets after challenge. Piglets were immunized twice (0 and 2 weeks) i.m. and sera were collected at 0, 2, and 4 weeks; piglets were then challenged at 4 weeks. A Indirect ELISA was performed with 1.25 μg/well of P. multocida. B Body temperatures recorded at 0, 2, 4, 6, 8 and 11 days are shown. S/P ratio = (Sample OD value − Negative OD value)/(Positive OD value − Negative OD value). Data are presented as the mean ± SD. Different superscript letters ^{(a, b, c)} indicate significant differences (p < 0.05) between treatment groups at the same time point based on Duncan’s test.