An example of naturally acquired passive immunity is__________________?
Correct answer: D. Placental transfer of antibodies
- A. Hepatitis vaccination
- B. Gamma globulin injection
- C. Immune blood transfusion
- D. Placental transfer of antibodies
Explanation
Placental transfer of maternal IgG gives the fetus temporary protection without the fetus producing the antibodies itself, making it naturally acquired passive immunity. Vaccination is artificially acquired active immunity, while injections and transfusions are artificial passive immunity.
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