Twelve healthy piglets without P. multocida antibodies were divided into three groups (n = 4 each). The vaccinated groups were immunized intramuscularly with 2 mL of (4) rPMT-NC + w/o/w + rSly (100 μg/mL), (5) rPMT-NC + w/o/w + rSly (150 μg/mL), or (6) PBS as a negative control (Table 1). The antibody titre was determined for blood samples taken at 0, 2 and 4 weeks after primary immunization. CD4+ and CD8+ T-cell analysis was performed at week 4.
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