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If a student enrolls with four doses of polio vaccine, all before age 4, is a booster required?

April 26, 2017age booster doses enrolls polio student vaccine

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If a student enrolls with four doses of polio vaccine, all before age 4, is a booster required?

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This depends on the type of polio vaccine received. If a combination vaccine, including both types of OPV and IPV, was used, then a booster at age four is not required. However, if the series is comprised of all IPV or all OPV, then a booster dose is required.