Bovine Respiratory Disease Flashcards

1
Q

Describe Mannheimia haemolytica

A

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.

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2
Q

What is the main problem with vaccinations and treatment for M. haemolytica?

A
  • Many serotypes are present, so its difficult to universally vaccinate
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3
Q

How is M haemolytica spread?

A
  • inhaling droplets, direct nose-to-nose contact, ingesting nasal discharge-contaminated feed
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4
Q

What are the clinical signs of M haemolytica?

A

depression, anorexia, fever, nasal
discharge, and a soft, moist cough, become apparent 6 to 10 days after a
stressful episode.

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5
Q

What is the prognosis for shipping fever?

A

Poor

- Mortality rate is high, survivors have irreversible lung damage

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6
Q

What is a distinguishing feature of shipping fever?

A
  • Severe fibrinous pluropneumonia

- Seen in the cranioventral lung lobes

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