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SESK: Stuff Everyone Should Know · sesk.info/health-vaccines-multiple-doses

Why do some vaccines require more than one dose?

One dose is not always enough to build strong protection.

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  1. The first dose never works
  2. Each dose protects against a different germ
  3. More doses build strong enough immunity ✔

Why: CDC says some vaccines need more than one dose to build strong enough immunity. Extra doses also help in case the first dose did not make enough antibodies.

Huh, didn't know that: CDC says some vaccines need more than one dose to give the best protection.

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References

Answer: More doses build strong enough immunity. CDC says some vaccines need more than one dose to build strong enough immunity. Extra doses also help in case the first dose did not make enough antibodies.

  1. CDC Reasons to Follow the Recommended Vaccine Schedule www.cdc.gov/vaccines-children/schedules/reasons-to-follow.html
    Some require more than one dose to build strong enough immunity to protect your baby.
    Checked 2026-10-11.

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