Antibiograms and plasmid profiles of <em>Pasteurella multocida</em> isolates from cattle in North Central Nigeria

Eighteen strains of Pasteurella multocida isolated from zebu cattle at the Veterinary Research Laboratory, National Veterinary Research Institute, Vom, in 2012, were screened for antimicrobial susceptibility and presence of plas- mids. Among the 18 isolates studied, 13 (72%) were susceptible to sulfamethoxazole/trimethoprim, 8 (44%) to gentamicin, 8 to amoxicillin / clavulanic acid, 7 (39%) to ciprofloxacin, 7 to chloramphenicol, 5 (28%) to ampicillin, 1 (5.6%) to oxacillin, and 1 to vancomycin. All the isolates were resistant to tetracycline and erythromycin. They all harbored a 5 kb plasmid. Three isolates of serotype E had an additional 3 kb plasmid and one had an additional 6 kb plasmid, but none carried all three plasmids