Biology Immunity PMDC Conceptual Practice
PMDC Verified Question 6 of 99
Which of the following is an example of passive acquired immunity?
A
Polio vaccination
B
Inoculation of tetanus toxoid
C
Transfer of maternal antibodies across the placenta and administration of antitoxin serum
D
Recovery from natural viral infection
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Transfer of maternal antibodies across the placenta and administration of antitoxin serum
Concept: Naturally acquired vs. artificially acquired passive immunity.

Solution: Passive immunity involves providing pre-formed antibodies to an individual. Examples include maternal transfer of \(\text{IgG}\) across the placenta (natural passive) and injection of pre-formed antitoxins/antisera (artificial passive).

Why other options are incorrect:
  • Option A & Option B: Vaccines and toxoids deliver antigens to stimulate the recipient's immune system into active immunity.

  • Option D: Recovery from an infection generates naturally acquired active immunity.

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