Which statement best describes passive immunity in an infant?
Correct answer: B. It gives immediate protection without lasting immune memory
- A. It develops memory cells after vaccination
- B. It gives immediate protection without lasting immune memory
- C. It requires exposure to a weakened microorganism
- D. It usually provides lifelong protection after one dose
Explanation
Passive immunity comes from ready-made antibodies and acts quickly, but it does not usually create immune memory. Active immunity develops after vaccination or infection and generally lasts longer.
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About Immunisation and EPI
Immunisation covers active and passive immunity, vaccine types, routine childhood schedules under Pakistan’s Expanded Programme on Immunization, administration routes and age-based timing. It also includes cold-chain maintenance, contraindications, adverse events following immunisation, missed doses and the distinction between vaccine protection and treatment of an established infection.
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