Which clinical scenario represents an example of artificial passive immunity?
Answer and explanation
Correct answer: B. Administration of purified intravenous tetanus antitoxin (antibodies) following a wound
Passive immunity involves the transfer of preformed antibodies rather than stimulation of the recipient's own immune system. Artificial passive immunity occurs when antibodies are medically administered (e.g., antivenom, rabies immunoglobulin, or tetanus antitoxin). Natural passive immunity occurs via maternal IgG crossing the placenta or IgA in breast milk. Vaccination confers artificial active immunity.
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