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BACTERIOLOGY LEC > Listeria > Flashcards

Listeria Flashcards

1
Q

What is the morphology of Listeria monocytogenes?

A

Gram-positive rods, non-acid fast, small, with tumbling motility

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2
Q

What is the primary habitat of Listeria monocytogenes?

A

Soil, water, animal and human feces, and silage

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3
Q

What is the oxygen requirement for Listeria monocytogenes?

A

Facultative anaerobe

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4
Q

What is the primary mode of infection for Listeria monocytogenes?

A

Ingestion of contaminated food or water

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5
Q

What disease does Listeria monocytogenes cause in ruminants?

A

Listeriosis

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6
Q

What is the Neural form of Listeriosis

A

circling disease

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7
Q

What is the Visceral form of Lesteriosis

A

septicemia, abortion

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8
Q

What is the neural form of listeriosis characterized by?

A

Unilateral ataxia, meningitis, and microabscesses in the brain stem

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9
Q

What is the visceral form of listeriosis characterized by?

A

Septicemia, liver necrosis, and abortion

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10
Q

What is the primary mode of infection for the neural form of listeriosis?

A

Via branches of the trigeminal nerve (eye, nose, oropharynx)

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11
Q

What is the primary mode of infection for the visceral form of listeriosis?

A

Ingestion of contaminated food or water

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12
Q

What disease does Listeria monocytogenes cause in chickens and turkeys?

A

Septicemia with necrotic foci in the liver and myocardium

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13
Q

What disease does Listeria monocytogenes cause in rabbits, guinea pigs, and chinchillas?

A

Septicemia with liver necrosis

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14
Q

What is the primary virulence factor of Listeria monocytogenes?

A

Listeriolysin O (a thiol-activated cytolysin)

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15
Q

What is the primary diagnostic method for Listeria monocytogenes?

A

Cold enrichment of brain tissue followed by culture on blood agar

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16
Q

What is the appearance of Listeria monocytogenes colonies on blood agar?

A

Small, flat, bluish-white colonies with narrow zones of beta-hemolysis

17
Q

What is the appearance of Listeria monocytogenes in gelatin?

A

Inverted fir tree pattern

18
Q

What is the primary serotype of Listeria monocytogenes associated with disease?

A

Serotype 1/2a, 1/2b, and 4b

19
Q

What is the primary treatment for listeriosis?

A

Penicillin, tetracycline, chloramphenicol, or sulfonamides

BACTERIOLOGY LEC (7 decks)

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