What type of immune response is conferred when an infant receives maternal antibodies across the placenta or through breast milk?
Answer and explanation
Correct answer: B. Naturally acquired passive immunity
- Step 1: Passive immunity involves the transfer of pre-formed antibodies rather than the recipient's immune cells producing them. Step 2. Because this transfer occurs via biological processes (placenta, lactation) without medical intervention, it is naturally acquired passive immunity. Answer: Naturally acquired passive immunity. Why not the others: Vaccines provide artificially acquired active immunity; infection recovery gives naturally acquired active immunity.
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