Pasteurella multocida Formerly known as PASTEURELLA SEPTICA
Introduction A group of related bacteria isolated from hemorrhagic septicemia in a variety of animals and birds are considered as strains of single sps. Designated as P.multocida
Morphology Non motile Gram negative bacilli Non sporing It resembles Yersinia in morphology
Culture Blood agar: moist, mucoid, and slimy growth (smooth watery colonies) Nutrient broth: granular deposits at the bottom of test tube Mac conkey agar: colourless, non lactose fermenting Yersinia pasteurella
Bio-chemical reactions Catalase: positive Oxidase: positive
Indole: positive Nitrate red.: +ve Gelatin: positive Lactose: non fermentor
Pathogenesis Often present in upper respiratory tract of animals such as sheep, dogs, cats, rats, and cattle Some times commensals in humans Infection Is by animal bites or trauma
Clinical manifestation Local suppurative infections after bite Wound infections, Cellulitis, Abscess, Osteomyelitis. Meningitis following head injury. Respiratory tract infection. Pneumonia, bronchitis, sinusitis Appendicitis and its abscess
Treatment Tetracyclin Streptomycin penicillin