Mannheimia Flashcards
What is considered to be the MOST IMPORTANT bacterial cause of respiratory disease in cattle AND sheep?
Mannheimia haemolytica
True or False
Mannheimia haemolytica causes mastitis in sheep and occasionally in cattle.
TRUE
All types of Mannheimia haemolytica AND Bibersteinia trehalosi produce a cytotoxin.
- The cytotoxin is toxic for what 2 things?
- What “type” of toxin is the cytotoxin?
- What affects does it have at low levels?
- What affects does it have at high levels?
- The cytotoxin is toxic for leukocytes and platelets of ruminants
- Cytotoxin = RTX toxin (pore-forming cytolysin)
- Altered leukocyte function @ low levels
- Lysis of leukocytes @ high levels
What is normal habitat of Mannheimia haemolytica?
Upper respiratory tract of cattle AND sheep
How is Mannheimia haemolytica transmitted?
Ingestion
Inhalation (most common)
Some studies indicate that ___ % of the bacterial pneumonias in feedlot cattle are due to Mannheimia haemolytica?
90%
What 3 organisms are involved in the shipping fever pneumonia complex in cattle?
- Mannheimia haemolytica
- Histophilus somni
- Pasteurella multocida
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
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.
Which diseases can Mannheimia haemolytica cause in sheep and goats?
Septicemia in the young
Pneumonia in adults
“Blue bag” mastitis
Which serotype of Mannheimia haemolytica is most often the disease producer in cattle?
Serotype 1
True or False
Mannheimia haemolytica is commonly isolated from swine, horses, and poultry as well.
FALSE
Rare!!!
