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Microbiology 386 > Mannheimia > Flashcards

Flashcards in Mannheimia Deck (13):
1

What is considered to be the MOST IMPORTANT bacterial cause of respiratory disease in cattle AND sheep?

Mannheimia haemolytica

2

True or False

Mannheimia haemolytica causes mastitis in sheep and occasionally in cattle.

TRUE

3

All types of Mannheimia haemolytica AND Bibersteinia trehalosi produce a cytotoxin.

  1. The cytotoxin is toxic for what 2 things?
  2. What "type" of toxin is the cytotoxin?
  3. What affects does it have at low levels?
  4. What affects does it have at high levels?

  1. The cytotoxin is toxic for leukocytes and platelets of ruminants
  2. Cytotoxin = RTX toxin (pore-forming cytolysin)
  3. Altered leukocyte function @ low levels
  4. Lysis of leukocytes @ high levels

4

What is normal habitat of Mannheimia haemolytica?

Upper respiratory tract of cattle AND sheep

5

How is Mannheimia haemolytica transmitted?

Ingestion

Inhalation (most common)

6

Some studies indicate that ___ % of the bacterial pneumonias in feedlot cattle are due to Mannheimia haemolytica?

90%

7

What 3 organisms are involved in the shipping fever pneumonia complex in cattle?

  1. Mannheimia haemolytica
  2. Histophilus somni
  3. Pasteurella multocida

8

What biotype and serotype of Mannheimia hemolytica can cause an acute fibrinous pleuropneumonia involved in the shipping fever complex in cattle?

Biotype A , serotype 1

9

True or False

Mannheimia hemolytica Serotype 2 is not frequently isolated, so it is not considered a pathogen in cattle.

FALSE

Serotype 2 is frequently isolate, but it is NOT considered a pathogen in cattle.

10

Which diseases can Mannheimia haemolytica cause in sheep and goats?

Septicemia in the young

Pneumonia in adults

"Blue bag" mastitis

11

Which serotype of Mannheimia haemolytica is most often the disease producer in cattle?

Serotype 1

12

True or False

Mannheimia haemolytica is commonly isolated from swine, horses, and poultry as well.

FALSE

Rare!!!

13