Chapter 3

Question 1

L.monocytogenes escapes from the phagocytic vacuole by elaborating a membrane damaging toxin called:

Answer 1

listeriolysin O

Question 2

Bacterium-produced membrane-degrading ……………. then mediate the passage of the organism directly to a neighboring cell, allowing avoidance cells of the immune system

Answer 2

phospholipases

Question 3

……… and ………. are the most commonly reported forms of infection (listeriosis)

Answer 3

Septicemia and meningitis

Question 4

…………… is a relatively common cause of newborn meningitis

Answer 4

L. monocytogenes

Question 5

True or false:

On blood agar, L. monocytogenes produces a large, grayish, and nonhemolytic, with an irregular border.

Answer 5

False.

On blood agar, L. monocytogenes produces a small colony surrounded by a narrow zone of β hemolysis

Question 6

Listeria species can be distinguished from various streptococci ( not staph) by:

Answer 6

morphology, motility, and the production of catalase.