59. Genera Mannheimia and Bibersteinia

Question 1

Habitat?

Answer 1

MANNHEIMIA, BIBERSTEINIA

Habitat: • mucous membranes (resp.)

Question 2

Morphology?

Answer 2

Morphology • 0.5-2 µm coccoid rods

Question 3

Staining?

Answer 3

Staining: • Gram-negative • bipolar staining

Question 4

Culture?

Answer 4

Culture:

• fastidious
• blood agar, yeast extract, pH-susceptibility
• β hemolysis

Question 5

Biochemistry?

Answer 5

Biochemistry:

• catalase +,
• oxidase +,
• fermentative
• leukotoxin production
• damage of macrophages and endothelial cells

Question 6

Antigens?

Answer 6

Antigens

• cell wall (cannot be used in diagnostics)
• capsule (M. haemolytica and B. trehalosi have common system)
• M. haemolytica 12 types
• B. trehalosi 4 types

Question 7

Resistance?

Answer 7

Weak

Question 8

Pathogenecity?

Answer 8

Pathogenicity:

• M. haemolytica • ruminants pneumonia • lamb septicaemia • mastitis • arthritis

• B. trehalosi • acute systemic pasteurellosis of feedlot lambs