If a vaccine contains a dead (killed) bacterium or virus, what is it that provokes a response from the patient's immune system?
A) bacterial toxins
B) NK cells
C) lymphocytes
D) antigens on the bacterium surface
Answer: D
A) Toxins do not provoke an immune response.
B) NK cells do not provoke an immune response.
C) Lymphocytes do not provoke an immune response.
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