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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