Four new measles cases in Montgomery County prompted a public health alert, with officials saying the infections appear in separate clusters and are not currently known to be linked.
Health officials warned measles can spread rapidly through the air and linger for up to two hours after an infected person leaves, raising risk for unvaccinated residents.
Two cases had already been reported in the county last week, and officials urged residents to check MMR vaccination status, watch for symptoms and call ahead before seeking in-person care.
Statewide, Gov. Kathy Hochul has declared an emergency after more than 100 measles cases in New York, underscoring concern that local clusters could widen.