What type of active immunity is acquired by an infant through the routine administration of the Bacillus Calmette-Guérin (BCG) vaccine at birth?
Answer and explanation
Correct answer: C. artificial active immunity
- Step 1: Vaccines introduce attenuated antigens into the body, prompting the infant's own immune system to produce antibodies and memory cells (active immunity). Step 2. Because the antigen is introduced medically, it is artificial. Answer: artificial active immunity. Why not the others: Natural passive immunity comes from maternal breast milk/placenta; artificial passive comes from antivenoms/antibodies; natural active comes from surviving an illness.
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