Non Enteric Gram -ve Part IV

Question 1

Two Moraxella species of importance and what they cause

Answer 1

• M. bovis: bovine kcs
• M. ovis: ovine kcs

Question 2

Bovine KCS

Answer 2

• animals <2yrs old more affected
• caused by trauma to cornea by flies, dust,UV light, projectiles on hay feeder, long grasses in pastures

Question 3

Clinical signs of infectuous bovine KCS

Answer 3

Lacrimation, blepharospasms, redness of eye, epiphora, corneal opacity or corneal ulcer

Worst case: corneal rupture

Question 4

What is the peak season for infectious bovine KCS and why?

Answer 4

March to August; b/c increased # of flies

Question 5

Typical morphology of Moraxella

Answer 5

• gram -ve
• plump, short rods
• on stained smears appear in pairs (diplobacili)

Question 6

Does M. bovis or M. ovis grow on MacConkey agar?

Answer 6

No

Question 7

Which 2 bacteria are select agents in the US?

Answer 7

• B. pseudomallei
• B. mallei

Question 8

Define select agents

Answer 8

Biological agents/toxins determined to have the potential to be a threat to public health/safety

Question 9

Reservoirs for Tularemia

Answer 9

Lagomorphs and rodents

Question 10

What causes CEM

Answer 10

Taylorella equigenitalis

Question 11

Typical disease feature of CEM in infected male/female equines

Answer 11

• mares: temporarily infertile; become longtime carriers
• stallions: don’t dev. clinical signs but harbor the agent

Question 12

Which bacteria in the chapter are considered foreign pathogens to the US?

Answer 12

• Taylorella equigenitalis
• Burkholderia mallei

Question 13

What bacterial agent was used against allied troop horses during WWI?

Answer 13

• Burkholderia mallei (Glander’s)

Question 14

Most DISTINCTIVE clinical sign of a horse w/ Glander’s

Answer 14

Bilateral purulent nasal discharge

Question 15

Is B. mallei or B. pseudomallei more abundant in the environment?

Answer 15

B. pseudomallei