Why Do Immunizations Require Two Doses

question 10

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)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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