Bacteria of the Eye

Question 1

what bacteria are common in causing keratitis?

contagious or noncontagious

Answer 1

Beta-hemolytic Streptococcus (e.g. S. canis, Strepzoo)
Staphylococcus spp.
Pseudomonas aeurginosa

non-contagious

Question 2

what bacteria are common in causing conjunctivitis?

Answer 2

Mycoplasma spp.
Chlamydia spp.

Question 3

is conjunctivitis more common in cats or horses and dogs?

Answer 3

cats - common; part of URT complex

horses/dogs uncommon - usually secondary to allergies, viral disease or irriatation

Question 4

Moraxella spp.
gram - or +
aerobe or anaerobe
diagnostics

Answer 4

only gram - coccobacilli or cocci
aerobe
does not grow on MacConkey Agar

Question 5

Moraxella spp. virulence factors

Answer 5

pilli (fimbriae)
endotoxin
capsule
hemolysin
protease
iron binding proteins

Question 6

what Moraxella spp. are associated with bovine infectious keratoconjunctivitis “IBK/pinkeye”?

Answer 6

“IBK” caused by…
Moraxella bovis
possible co-infection with M. bovocui & M. ovis

Question 7

risk factors for Moraxella spp.

Answer 7

irritants, infection (dust, tall grass, UV, hypovitaminosis A, BHV1)
calves
seasons (summer/fall)
face flies

Question 8

Control Measures for Moraxella spp.

Answer 8

vx no efficacy
vx for viral resp pathogens
control flies, dust
shade