Listeria Flashcards
Module 6
The only pathogenic species for Genus Listeria
Listeria monocytogenes
Morphology of Listeria
Diphtheroid, Coccoid, Peritrichous Flagella
True or False,
Listeria is Catalase negative
False, it produces catalase
Known as circling disease in neural form
Listeriosis
Modes of Infection
Neural and Visceral
This mode of infection infects branches of Trigeminal nerve, eye, nose, and oropharynx
Neural Form
This mode of infection starts with ingestion of microorganims
Visceral form
Most common form of infection in Ruminants
Neural Form
Listeria is known to be
a. Obligate aerobic Intracellular Parasite
b. Facultative Intercellular Parasite
c. Obligate anaerobe Intracellular Parasite
d. Facultative Intracellular Parasite
D. Facultative Intracellular Parasite
What substance is produced by the bacterium enclosed in the phagosome that lyses membrane of phagosome w/c allows bacteria to escape to cytoplasm of host cell
Hemolysin listeriolysin O
Is a thiol-activated cytolysin that can lyse cholesterol containing membranes of Eukaryotic cells
Hemolysin listeriolysin O
True or False,
Listeria is Resistant to drying
True
Treatment for Listeria
- Chloramphenicol
- Tetracycline
- Sulfonamides
- Penicillin
- Erythromycin
Motility of Listeria
Tumbling motility
Effect of L. monocytogenes on CNS
unilateral ataxia and meningitis
Effect of L. monocytogenes on Cattle and Sheep
Keratoconjunctivitis and Ophthalmitis
True or False,
L. monocytogenes can survive highly acidic environment (ex. pH 3.7)
False, they cannot survive pH below 5
Listeriosis is affiliated with the increased intake of what mineral
Iron
On what phase of it’s life cycle can Listeria be Gram negative
Young and Old cultures
