What was the reason for implementing 2 doses of live-attenuated measles vaccine?

Updated: Jun 06, 2019
  • Author: Selina SP Chen, MD, MPH; Chief Editor: Russell W Steele, MD  more...
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The practice of administering 2 doses of live-attenuated measles vaccine to children to prevent school outbreaks of measles was implemented when the vaccine was first licensed in 1963. The immunization program resulted in a decrease of more than 99% in reported incidence.

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