MORAXELLA

Question 1

What are the predisposing factors of M. bovis?

Answer 1

1. Prolonged exposure to sunlight (UV light)
2. Breed susceptibility
3. Concurrent Viral infections (Infectious Bovine Rhinotracheitis)
4. Mycoplasma infections
5. Ureaplasma infections

Question 2

Virulent strains of M. bovis produces what colonies?

Answer 2

Rough colonies with beta hemolysis

Question 3

What are the clinical signs accompanying keratoconjunctivitis?

Answer 3

1. Photophobia
2. Blepharospasm
3. Profuse lacrimation
4. Mucopurulent discharge

Question 4

The preferred diagnostic method for M. bovis is ?

Answer 4

FAT

Question 5

M. bovis infection is most prevalent during what season?

Answer 5

Summer

Question 6

M. ovis affects what animals? What disease does it induce?

Answer 6

• Sheep and goats
• Keratoconjunctivitis in mule, deer, and moose

Question 7

M. bovis occurs as a commensal of ?

Answer 7

Conjunctiva and nasopharynx of cattle

Question 8

M. cuniculi affects what animals?

Answer 8

Rabbits

Question 9

Moraxella spp. ferment CHO. True or False?

Answer 9

False

Question 10

M. phenolpyruvica affects what animals?

Answer 10

• Cattle
• Sheep
• Swine
• Goats

Question 11

Describe the morphology of Moraxella.

Answer 11

• Gram negative
• Non-motile
• Non-spore forming
• Rods/coccobacilli

Question 12

M. bovis causes what disease?

Answer 12

Infectious bovine keratoconjunctivitis

Question 13

Moraxella spp. require X and V factors. True or False?

Answer 13

False

Question 14

M. caviae affects what animals?

Answer 14

Guinea pigs

Question 15

Moraxella is oxidase positive but catalase negative. True or False?

Answer 15

False, catalase positive

Question 16

M. lacuna affects what animals? What diseases does it induce?

Answer 16

• Aborted equine fetuses
• Septicemia in goats
• Viral pneumonia in goats and encephalitis

Question 17

Describe the colonies of M. bovis.

Answer 17

• Colonies are usually round, translucent, grayish-white, 1-2 mm in diameter and surrounded b a narrow zone of beta-hemolysis.
• After 2-3 days, colonies enlarge and becomes somewhat flattened with raised centers.

Question 18

M. bovis immunization methods last for only for a short amount of time. True or False?

Answer 18

True

Question 19

M. bovis has pili. True or False?

Answer 19

True, (Type IV)

Question 20

M. caprae affects what animals?

Answer 20

Goats

Question 21

M. bovis affects what animals?

Answer 21

Cattle and horses

Question 22

M. bovis is more common in beef or dairy cattle?

Answer 22

Beef cattle

Question 23

Growth of M. bovis is enhanced by ?

Answer 23

Addition of blood/serum

Question 24

M. bovis spread commonly by ?

Answer 24

Flies
* Musca autumnalis
* M. domestica
* Stomoxys calcitrans

Question 25

M. boevrei affects what animals?

Answer 25

Goats

Question 26

M. canis affects what animals?

Answer 26

Dogs and cats