★ Types of Immunity Quiz
Why does active immunity remains for a long period of time?
A. Due to prolong injection of antibodies into human body
B. The presence of phagocytes to engulf the pathogens
C. Increase in mast cells that help produce histamine
D. Production of memory B cells that increase antibodies
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Vaccine is an example of _____________
A. Natural active immunity
B. Natural passive immunity
C. Artificial active immunity
D. Artificial passive immunity
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