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Protection produced by a person's own immune system after stimulation by an antigen usually lasts how long?
AA few weeks to a few months
BMany years and often a lifetime
COnly until the next exposure
DOnly while the antigen remains
Answer & Solution
Correct answer: B. Many years and often a lifetime
1. Active immunity is produced by the person's own immune system when an antigen stimulates it.
2. Memory B-cells then circulate in the blood and sit in the bone marrow for many years.
3. Protection therefore lasts many years and often a lifetime, which is called immunologic memory.
4. The few weeks to few months option describes passive immunity, where borrowed antibody degrades.
_Source: CDC Epidemiology and Prevention of Vaccine-Preventable Diseases (Pink Book), section Active Immunity_
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