Which of the following situations can best be characterized as an example of passive immunity?
A)
A 6-month-old infant receives his scheduled immunization against measles, mumps, and rubella.
B)
A 9-year-old boy is immune to chicken pox after enduring the infection before 1 year.
C)
An 8-year-old girl recovers from a respiratory infection after intravenous antibiotic treatment.
D)
A 6-week-old infant receives antibodies from his mother's breast milk.
Ans:
D
Feedback:
Passive immunity involves the transfer of antibodies from an outside source, such as those from breast milk. Immunization and recovery from illness involve active immunity.
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