In a vaccination programme in Kenya, children were immunized against measles. The vaccine contained weakened measles virus. Which of the following best describes what happens after the vaccine is injected?

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Question

In a vaccination programme in Kenya, children were immunized against measles. The vaccine contained weakened measles virus. Which of the following best describes what happens after the vaccine is injected?

Accepted Answer

Lymphocytes produce specific antibodies and memory cells are formed — Award 1 mark for recognizing that vaccination triggers lymphocytes to produce specific antibodies and establish immunological memory through memory cells. A is incorrect because red blood cells do not destroy pathogens. B is incorrect because weakened vaccines typically do not cause disease symptoms. D is incorrect because phagocytosis is only part of the immune response; specific antibody production is essential for vaccination effectiveness.

Answer

Red blood cells immediately destroy the virus

Answer

Lymphocytes produce specific antibodies and memory cells are formed

Answer

The child develops symptoms of measles but recovers quickly

Answer

Phagocytes engulf the virus and no other immune response occurs

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