new_n_lost
Politically InCorrect
Topics: 653
Posts: 6,081
|
A 45-year-old homeless man has a chronic cough, a cavitary lesion of the lung, and is sputum positive for acid-fast bacilli.
Which of the following is the principle form of defense by which the patient's body fights this infection?
A. Antibody-mediated phagocytosis
B. Cell-mediated immunity
C. IgA-mediated hypersensitivity
D. IgE-mediated hypersensitivity
E. Neutrophil ingestion of bacteria
___________________
FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
|
| po
Forum Elite
Topics: 39
Posts: 356
|
B
|
| rock
Forum Elite
Topics: 23
Posts: 305
|
B
|
| new_n_lost
Politically InCorrect
Topics: 653
Posts: 6,081
|
___________________
FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
|
| new_n_lost
Politically InCorrect
Topics: 653
Posts: 6,081
|
The correct answer is B.
The principle host defense in mycobacterial infections (such as this patient's tuberculosis) is cell-mediated immunity, which causes formation of granulomas. Unfortunately, in tuberculosis and in many other infectious diseases characterized by granuloma formation, the organisms may persist intracellularly for years in the granulomas, only to be a source of activation of the infection up to decades later.
While antibody-mediated phagocytosis (choice A) is a major host defense against many bacteria, it is not the principle defense against Mycobacteria.
IgA-mediated hypersensitivity (choice C) is not involved in the body's defense against Mycobacteria.
IgE-mediated hypersensitivity (choice D) is not involved in the body's defense against Mycobacteria. It is important in allergic reactions.
Neutrophil ingestion of bacteria (choice E) is a major host defense against bacteria, but is not the principle defense against Mycobacteria.
___________________
FORUM RULES-- Those who believe in telekinesis, raise my hand. I get enough exercise just by pushing my luck --P4U World.." The pure and simple truth is rarely pure and never simple."
|
| lq2006
Forum Elite
Topics: 43
Posts: 382
|
B
|
| Capricious
Forum Newbie
Topics: 0
Posts: 26
|
b
|
| GoodGirl
.
Topics: 93
Posts: 1,213
|
I missed all the fun  , was waiting whole day for some immuno Q, and I missed it. 
( at least it was an easy one  ).
___________________
Prioritize & simplify.
|
| spider
Forum Newbie
Topics: 0
Posts: 10
|
NO question B..good explanation.
|
| therainmaker
Forum Newbie
Topics: 3
Posts: 22
|
man thats too easy a question ....hehehehe
|
| spinal shock
Forum Senior
Topics: 12
Posts: 99
|
B
___________________
we expect others wishes, we dont miss something that we dont expect to have
|
|
| |
| | | | | | | | | | | |
