Listeria

Question 1

The only pathogenic species for Genus Listeria

Answer 1

Listeria monocytogenes

Question 2

Morphology of Listeria

Answer 2

Diphtheroid, Coccoid, Peritrichous Flagella

Question 3

True or False,

Listeria is Catalase negative

Answer 3

False, it produces catalase

Question 4

Known as circling disease in neural form

Answer 4

Listeriosis

Question 5

Modes of Infection

Answer 5

Neural and Visceral

Question 6

This mode of infection infects branches of Trigeminal nerve, eye, nose, and oropharynx

Answer 6

Neural Form

Question 6

This mode of infection starts with ingestion of microorganims

Answer 6

Visceral form

Question 6

Most common form of infection in Ruminants

Answer 6

Neural Form

Question 6

Listeria is known to be

a. Obligate aerobic Intracellular Parasite
b. Facultative Intercellular Parasite
c. Obligate anaerobe Intracellular Parasite
d. Facultative Intracellular Parasite

Answer 6

D. Facultative Intracellular Parasite

Question 7

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

Answer 7

Hemolysin listeriolysin O

Question 8

Is a thiol-activated cytolysin that can lyse cholesterol containing membranes of Eukaryotic cells

Answer 8

Hemolysin listeriolysin O

Question 9

True or False,

Listeria is Resistant to drying

Answer 9

True

Question 10

Treatment for Listeria

Answer 10

• Chloramphenicol
• Tetracycline
• Sulfonamides
• Penicillin
• Erythromycin

Question 10

Motility of Listeria

Answer 10

Tumbling motility

Question 11

Effect of L. monocytogenes on CNS

Answer 11

unilateral ataxia and meningitis

Question 12

Effect of L. monocytogenes on Cattle and Sheep

Answer 12

Keratoconjunctivitis and Ophthalmitis

Question 13

True or False,

L. monocytogenes can survive highly acidic environment (ex. pH 3.7)

Answer 13

False, they cannot survive pH below 5

Question 14

Listeriosis is affiliated with the increased intake of what mineral

Answer 14

Iron

Question 15

On what phase of it’s life cycle can Listeria be Gram negative

Answer 15

Young and Old cultures