Time line and mean rectal temperature: comparison between carrier animals and negative control animals. **indicates a significant difference of p < 0.05 compared with the negative control group. a: Day 1: inoculation of P. multocida B:2 to group 1. b: Day 2: all animals in group 1 euthanised. c: Day 5 and 6: positive isolation made from nasal and rectal swabs from carrier animals in group 2 (2A, 2B, 2C). Day 7: 2D euthanised. d: Day 15: positive P. multocida B:2 from rectal swab of 2A. e: Day 16: positive P. multocida B:2 from nasal swabs of all carriers and rectal swab of 2B. f: Day 17: positive P. multocida B:2 from nasal swab of 2A as well as rectal and vaginal swabs of all carriers.