Protective effect following intranasal exposure of goats to live Pasteurella multocida B:2.
This study aimed to determine the effect of intranasal exposure to low doses of Pasteurella multocida B:2 on survival of goats challenged with high doses of the same organism. Eighteen goats were selected and divided into three groups. Goats of group 1 were exposed intranasally twice, with a two-week interval, to 7 x 10(6) cfu/ml of live P. multocida B:2. Goats of group 2 were not exposed to P. multocida B:2 but were kept together with the exposed group 1. Goats of group 3 remained as unexposed controls and were kept separated from the other two groups. Serum samples were collected at weekly intervals to determine the antibody levels. At week 5 post exposure, all goats were challenged subcutaneously with 3.7 x 10(10) cfu/ml of live P. multocida B:2. Following challenge exposure, 8 (67%) goats (4 goats from each of groups 1 and 2) were killed owing to haemorrhagic septicaemia. Four goats were killed peracutely within 48 h post challenge, while the other four goats were killed acutely between 2 and 4 days post challenge. None of the goats of group 3 were killed for haemorrhagic septicaemia. Goats of groups 1 and 2 showed significantly (p < 0.05) higher antibody levels following the first intranasal exposure to P. multocida B:2. However, only group 1 retained the significantly (p < 0.05) high antibody levels following a second intranasal exposure, and remained significantly (p < 0.05) higher than groups 2 and 3 at the time of challenge. P. multocida B:2 was successfully isolated from various organs of goats that were killed between 1 and 4 days post challenge.
Zamri-Saad
M
M
Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang. zamri@vet.upm.edu.my
Ernie
Z A
ZA
Sabri
M Y
MY
D000281:Administration, Intranasal; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood*; D001428:Bacterial Vaccines / Q000276:immunology*; D015169:Colony Count, Microbial / Q000662:veterinary; D015511:Goat Diseases / Q000382:microbiology / Q000473:pathology / Q000517:prevention & control*; D006041:Goats; D010326:Pasteurella Infections / Q000382:microbiology / Q000473:pathology / Q000517:prevention & control / Q000662:veterinary*; D016979:Pasteurella multocida / Q000276:immunology* / Q000472:pathogenicity*; D011897:Random Allocation; D013997:Time Factors
D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines