Bacte Lec: Moraxella Flashcards
Description of moraxella
● Small
● Gram-negative
● Aerobic
● Nonmotile rods or coccobacilli
● Catalase- and oxidase-positive
● Do not use carbohydrates
● Do not require X or V factors
Is moraxella motile?
Nonmotile rods or coccobacilli
Is Moraxella catalase or oxidase positive?
Yes
Moraxella that is found on cattle and horses
M. bovis
Moraxella that is found on Dogs and cats; human bite wounds
M. canis
Moraxella that is found on goats
M. caprae & M. boevrel
Moraxella that is found on rabbits
M. cuniculi
Moraxella that is found on guinea pigs
M. caviae
Moraxella that is found on sheep and goats; keratoconjunctivitis in mule deer and moose
M. ovis
Moraxella that is found on many animal species and humans; isolated from aborted equine fetuses, septicemia in a goat, and goats with viral pneumonia and encephalitis
M. lacunata
Moraxella that is found on cattle, sheep, swine, goats
M. phenolpyruvica
What Moraxella genus usually causes disease?
M. bovis and M. lacunata
What causes Infectious Bovine Keratoconjunctivitis (pinkeye) (IBK)?
Moraxella bovis
Moraxella that occurs as a commensal on the conjunctiva and in the nasopharynx of cattle
Moraxella bovis
Moraxella bovis is spread most commonly by?
Flies (Musca autumnalis, Musca domestica, and Stomoxys calcitrans), but it can also be spread by direct contact
T/F: IBK is prevalent during winter
False: Prevalent during the summer, young cattle are more susceptible
In Infectious Bovine Keratoconjunctivitis what is the known contributing factor in some outbreaks?
Vitamin A deficiency
What occurs within 72 hours of IBK?
Corneal ulcers
This aids in adherence and corneal colonization of IBK
Pili (type IV)
In IBK what colonies are produced?
Rough colonies that are beta-hemolytic
What are the characteristics of colony of IBK?
Colonies are usually round, translucent, grayish-white, 1-2 mm in diameter, and surrounded by a narrow zone of beta hemolysis
T/F: Moraxella bovis is non-motile, non-spore-forming, and encapsulated.
True
T/F: M. bovis does not reduce nitrates, and indole is not formed.
True
Does M. bovis liquefy gelatin?
Liquefies gelatin slowly.
Does M. bovis grow on MacConkey agar?
No, it does not grow.
What are the specimens used for fluroscent anti-body test of M.bovis?
Tears and ocular discharges and from cultures
Clinical signs of Infectious Bovine Keratoconjunctivitis
Signs accompanying the keratoconjunctivitis are photophobia, blepharospasm, and profuse lacrimation followed by a discharge that may become mucopurulent
Other predisposing factors of IBK:
- prolonged exposure to sunlight (ultraviolet light)
- breed susceptibility, and con-current viral (particularly infectious bovine rhinotracheitis)
- mycoplasmal, or ureaplasmal infections.
