Bovine Respiratory Disease Flashcards
Describe Mannheimia haemolytica
Family Pasteurellaceae
• Small, facultatively anaerobic, nonmotile, gram-negative rods or
coccobacilli that do not form endospores.
• Mannheimia haemolytica is one of the most important pathogens of
domestic cattle.
• Primary bacterial agent responsible for bovine pneumonic
pasteurellosis, also known as “shipping fever”
• Accounts for approximately 30% of the total cattle deaths globally.
• A recent study estimated the annual economic loss to the U.S. beef
cattle industry at $640 million.
What is the main problem with vaccinations and treatment for M. haemolytica?
- Many serotypes are present, so its difficult to universally vaccinate
How is M haemolytica spread?
- inhaling droplets, direct nose-to-nose contact, ingesting nasal discharge-contaminated feed
What are the clinical signs of M haemolytica?
depression, anorexia, fever, nasal
discharge, and a soft, moist cough, become apparent 6 to 10 days after a
stressful episode.
What is the prognosis for shipping fever?
Poor
- Mortality rate is high, survivors have irreversible lung damage
What is a distinguishing feature of shipping fever?
- Severe fibrinous pluropneumonia
- Seen in the cranioventral lung lobes