Moraxella

Question 1

Moraxella is a gram _____ bacteria.

Answer 1

Negative

Question 2

True/False. M. bovis is pleomorphic rods in pairs or chains that are non-motile.

Answer 2

True

Question 3

M. bovis is catalase _____ and oxidase ______.

Answer 3

Positive and positive

Question 4

True/False. Moraxella bovis is an obligate symbiotic and obligate pathogenic.

Answer 4

True

Question 5

True/False. M. bovis is not resistant in the environment.

Answer 5

FALSE.

Moraxella bovis has quite a resistance in the environment

Question 6

Which species of Moraxella causes infectious bovine keratoconjunctivitis and is highly infectious?

Answer 6

M. bovis

Serous to purulent conjunctivitis and keratitis

Question 7

What is an essential virulence factor to M. bovis?

Answer 7

Fimbriae

Adhesion to host cell (eye): conjunctival and corneal epithelial cells

Question 8

What is the general pathogenesis of M. bovis?

Answer 8

1. Attachment of bacteria to conjunctival/corneal epithelia
2. Production of toxin and destuction of tissue
3. Inflammation
4. More growth and toxin production and more damage
5. Increased susceptibility for other pathogens
6. Irreversible eye damage

Question 9

What other organisms cause infectious bovine keratoconjuntivitis?

Answer 9

Bovine herpes virus 1

Myoplasma bovoculi

Listeria monocytogenes

Question 10

How is pink eye transmitted?

Answer 10

Direct contact with infected animals

Also flies

Question 11

How do you treat pink eye?

Answer 11

Antibiotics: local and systemically when serious

Corticosteroids if inflammation is serious

Question 12

Which species of Moraxella is diplococci and associated with keratoconjunctivitis in bovines?

Answer 12

M. bovoculi

Question 13

Which species of Moraxella is diplococci and associated with keratoconjunctivitis AND pneumonia in bovines?

Answer 13

M. ovis