58. Genus Pasteurella.

Question 1

Habitat, Morphology and Staining?

Answer 1

PASTEURELLA
1. Habitat:
• mucous membranes (respiratory tract)
2. Morphology:
• 0.5-2 µm coccoid rods
• capsule production
3. Staining:
• Gram-negative
• bipolar staining

Question 2

Culture?

Answer 2

4. Culture
   • fastidious
   • blood agar
   • yeast extract
   • pH-susceptibility
   • colony types
   • M-S-R colonies
   • smell

Question 3

Biochemistry?

Answer 3

Biochemistry:
• catalase +,
• oxidase +,
• fermentative
• cytotoxin production
• P. multocida D
• dermonecrotoxin: damage of the osteoblasts
• P. multocida subspecies:
• biochemical differences

Question 4

Antigens and Resistance?

Answer 4

6. Antigens
• P. multocida
• cell wall
• 16: Heddleston system
• (11 Namioka system)
• capsule
• A, B, D, E, F
7. Resistance

weak

Question 5

Pathogenicity?

Answer 5

8. Pathogenicity:
• P. multocida A, D:• ruminants, swine pneumonia,
• rabbit septicaemia, pneumonia,• fowl cholera
• P. multocida D: atrophic rhinitis of swine,
• P. multocida B, E: haemorrhagic septicaemia
• P. pneumotropica: lab. rodents pneumonia, dog, cat oral cavity
• P. aerogenes: alimentary tract of swine, abortion
• P. canis, P. dagmatis, P. stomatis: dog, cat oral cavity, bite
• P. caballi: horse respiratory infection