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MMR vaccine
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- 1Illinois reports 23 measles cases in 2026▼Illinois reports 23 measles cases in 2026, urges residents to check vaccinations
Illinois health officials have confirmed 23 measles cases so far in 2026 and are urging residents to verify their vaccination status. The state's public health department is encouraging people to check that they and their children are up to date on the MMR vaccine as officials work to contain the outbreak.