Question

question 6 (1 point) ✓ saved
shistosomes use a \cloaking device\ to help them infect the immune system.
a) true
b) false
question 7 (1 point) ✓ saved
one in three american adults carries hsv.
a) true
b) false
question 8 (1 point) ✓ saved
asymptomatic colonization of women by a beta-hemolytic streptococcus in lancefield group b
a) is very uncommon.
b) can result in colonization of infants prior to birth through transplacental transfer.
c) can infect infants during passage through the birth canal causing them to experience life-threatening bloodstream infections.
d) can infect infants during passage through the birth canal causing them to experience life-threatening skin infections.

Explanation:

Question 6

Schistosomes (shistosomes) can acquire host antigens (a "cloaking device") to evade the immune system, allowing infection. So the statement is true.

The prevalence of HSV (herpes simplex virus) in American adults is actually higher, with estimates around one in two for HSV - 1 and significant rates for HSV - 2. So the "one in three" statement is false.

• Option a: Asymptomatic colonization by group B Streptococcus (GBS) in women is common, so a is wrong.
• Option b: GBS is not transmitted transplacentally; it is acquired during birth canal passage, so b is wrong.
• Option c: Infants can get GBS during birth canal passage, and GBS can cause life - threatening bloodstream infections (sepsis) in infants, which is correct.
• Option d: GBS causes bloodstream/invasive infections, not primarily skin infections, so d is wrong.

Answer:

a) True

Question 7