Why Do Immunizations Require Two Doses

question 125

Multiple Choice

Why do immunizations require two doses?

• A) The first dose stimulates the effector cells only, and the second dose stimulates the memory cells only.
• B) The first dose stimulates the primary immune response, and the second dose stimulates the secondary immune response.
• C) In case the first dose isn't enough to induce immunity, a second dose is given.
• D) It is a way for doctors to make more money.
• E) Both c and d are correct.

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