Why is a second dose of measles vaccine recommended?

Updated: Jun 06, 2019
  • Author: Selina SP Chen, MD, MPH; Chief Editor: Russell W Steele, MD  more...
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A second dose of vaccine, now recommended for all school-aged children in the United States, [12] induces immunity in about 95% of the 5% who do not respond to the first dose. Slight genotypic variation in recently circulating strains has not affected the protective efficacy of live-attenuated measles vaccines.

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