Why Do Immunizations Require Two Doses

question 30

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 is not enough to induce immunity, a second dose is given.
• D) The first dose often is ineffective.
• E) The first dose stimulates the innate immune response, and the second dose stimulates the adaptive immune response.

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