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- Aerobic to facultatively anaerobic, non-motile small Gram-negative bacillus or may appear as coccobacillus.
- Grows best on 5% sheep blood agar at 37°C.
- Usually catalse- and oxidase-positive.
- Pasturella multocida the most common species causing human infection.
- Others include P. multocida subspecies septica, and P. multocida subsp gallicida, P. canis., P. dagmatis and P. stomatis.
- Typing of usually done by serology examining capsular antigens (A-F) although molecular methods also capable.
- Common inhabitant of feline > canine oral flora. Common cause of illness in rabbits.
- Often part of polymicrobial aerobic and anaerobic flora of domestic pet bite wound infections.
- Animal bites or scratches may result in cellulitis +/- bacteremia.
- Pasteurella usually susceptible to penicillins, tetracyclines or chloramphenicol.