One way to test if someone has immunity to a particular pathogen is to measure t
ID: 35596 • Letter: O
Question
One way to test if someone has immunity to a particular pathogen is to measure the antibody titer. What does it mean if someone has a positive antibody titer?
A) Previous exposure to the pathogen (or through a vaccination) has caused B cells to produce memory B cells. When re-exposed to the pathogen, they rapidly produce antibodies against the antigen (resulting in a positive antibody titer). B) Previous exposure to the pathogen has caused T cells to attack the pathogen, leading to a more rapid response by T cells upon repeat exposure. C) They must not have been exposed to the pathogen previously, meaning that they were able to rapidly produce antibodies. D) They must not have been exposed to the pathogen previously, meaning that they were not able to rapidly produce antibodies.Explanation / Answer
A) Previous exposure to the pathogen (or through a vaccination) has caused B cells to produce memory B cells. When re-exposed to the pathogen, they rapidly produce antibodies against the antigen (resulting in a positive antibody titer).
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