Q: Why are some fully vaccinated people getting measles?
A: While two doses of the MMR vaccine are 97% effective at preventing measles, breakthrough infections can still occur in a small percentage (approximately 5% of total) of fully vaccinated individuals, especially during widespread outbreaks with high viral circulation.
Q: Why is there more measles activity?
A: U.S. MMR coverage among kindergarteners is now below the 95% coverage target (much lower in some communities) and is decreasing. At the same time, global measles activity is increasing, meaning more chances of an unvaccinated person infected with measles abroad returning to the U.S.
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