Nassau County detects first measles case since 2024, prompting vaccination push

Nassau County health officials confirmed a laboratory-tested measles case in an unvaccinated child under five—the county’s first since 2024—triggering a state-wide investigation and urging anyone possibly exposed who has symptoms to seek medical care. Measles is highly contagious and can cause serious complications; officials say two doses of the MMR vaccine are the best prevention. Nassau and Suffolk counties have about 82% of residents with at least one MMR dose (well below the 95% herd immunity target); Suffolk reports no current measles cases, while Nassau continues monitoring the situation.