Listeria monocytogenes

Question 1

Listeria monocytogenes is contracted by?

Answer 1

ingestion of contaiminated raw milk or cheese; vaginal transmission

Question 2

Is Listeria monocytogenes gram postive or negative?

Answer 2

gram postive non forming rods

Question 3

Culture requirements are?

Answer 3

low temperature (2.5 *C)

Question 4

Is Listeria monocytogenes catalase positive or negative?

Answer 4

positive

Question 5

Is Listeria monocytogenes a hemolytic or b hemolytic

Answer 5

B hemolytic

Question 6

Listeria monocytogenes is a

Answer 6

facultative intrecellular anaerobic parasite

Question 7

What are the virulence factors of Listeria monocytogenes

Answer 7

1) Flagella ( H-Ag(+))
2) hemolysin
- heat table
- antigenic

Question 8

What are the clinical manifestation of Listeria monocytogenes

Answer 8

1) neonatal meningitis
2) meningitis in immuno-suppressed pts*
3) septicemia

• cell-mediated immunity protective
• *only gram (+) w/endotoxin (LPS-Lipid A) - clinical siginificance is ambiguous

Question 9

What are the treatments for Listeria monocytogenes?

Answer 9

1. ampicillin

2. trimethoprim/sulfamethoxazole