Pasteurellaceae: Mannheimia haemolytica and a few other random bacteria

Question 1

What is the most frequent bacterial agent associated with the bovine respiratory disease complex (shipping fever)?

Answer 1

Mannheimia haemolytica capsule type 1

Question 2

M. haemolytica is a gram ______ bacteria.

Answer 2

Negative

[rods]

Question 3

Does M. haemolytica grow in MacConkey agar?

Answer 3

Yes

[its hemolytic]

Question 4

Which extracellular toxin produced by M. haemolytica is a pore-forming cytolysin?

Answer 4

Leukotoxin (rtx family)

(bovine/ruminant specific)

(weakly hemolytic on bovine/sheep blood only)

Question 5

What are the clinical signs of bovine shipping fever pneumonia?

Answer 5

Marked by high fever, anorexia, respiratory signs variable initially

Nasal discharge

Coughing

Dyspnea

Question 6

How would you diagnose shipping fever?

Answer 6

Necrospy and histopathology

Culture of lesions at necropsy

Question 7

Which bacteria is associated with septicemia in lambs?

Answer 7

M. haemolytica and Biberstenia trehalosi

[resembles bovine hemorrhagic septicemia]

Question 8

Which bacteria is associated with enzootic pnuemonia in sheep?

Answer 8

M. haemolytica

Question 9

Which bacteria are associated with mastitis in late lactation in sheep and goats?

Answer 9

M. maemolytica and B. trehalosi

Question 10

Which bacteria causes “new duck diseases” that causes septicemia and severe polyserositis?

Answer 10

Riemerella anatipestifer

Sudden mortalities, with respiratory signs and discharges of eye and nose

Question 11

Which bacteria causes septicemia in dolphins and humans?

Answer 11

Photobacterium damsela subsp. damselae

[facultative intracellular organisms]

Question 12

Which bacteria causes septicemic disease in farmed fish?

Answer 12

Photobacterium damselae subsp. piscicida

[falcultative intracellular organism]