Loading....
Coupon Accepted Successfully!

Microbiology

Open Flashcards

Mycobacterium

Question
13 out of 22
 

A 45-year-old traveler discovers that he has converted from negative to positive on the tuberculin (PPD) skin test. This indicates which of the following?



A He has active tuberculosis.

B He has delayed-type hypersensitivity against Mycobacterium tuberculosis.

C He is most likely to be infected with an "atypical" Mycobacterium.

D He needs to immediately isolated to prevent spread of M. tuberculosis

Ans. B He has delayed-type hypersensitivity against Mycobacterium tuberculosis.

a. The purified protein derivative (PPD) skin test, or tuberculin skin test, contains several proteins from M. tuberculosis, which when combined with waxes elicits a delayed hypersensitivity.

b. It does not assess for the status of infection, but only speaks about prior exposure. The clinical presentation and/or chest radiograph would be the next steps in evaluation.

Mycobacterium Flashcard List

22 flashcards
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
19)
20)
21)
22)