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Measles Outbreaks Escalate in London and California as Officials Move to Shield Schools and Boost Shots

Low MMR uptake has left large cohorts susceptible, driving fresh clusters on both sides of the Atlantic.

Overview

  • London’s health leaders convened an extraordinary session after the north London cluster grew, with current practice in Enfield keeping unvaccinated pupils out of school during exposure periods and further restrictions under discussion.
  • UK officials reported 127 confirmed measles cases across London, including 71 in Enfield, and cited roughly 300 suspected cases as UKHSA warned containment is difficult given transmission before the rash appears.
  • Enfield’s guidance advises excluding unvaccinated children for three weeks after contact, while temporary vaccination clinics and intensified contact tracing continue across affected schools and neighborhoods.
  • In Sacramento County, an infectious unvaccinated child likely exposed up to 130 children at an educational program, prompting a temporary closure, six confirmed cases across Sacramento and Placer counties, and hospital-based contact tracing after a clinic visit.
  • The CDC counts more than 1,200 U.S. measles cases so far this year, mostly linked to outbreaks in undervaccinated communities, and health officials are urging catch‑up MMR vaccination to prevent severe illness and wider spread.