CDC says this is a problem for young kids more than the adults (who presumably were properly vaccinated) "CDC considers people who received two doses of measles vaccine as children ... protected for life, and they do not ever need a booster dose."
https://www.cdc.gov/measles/about/faqs.html#need-booster https://x.com/Ymax/status/1114591456705097729
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April 6, 2019