(CNN)A massive measles outbreak that spread across parts of Brooklyn since October has ended, New York City health officials announced Tuesday. This marks the end of the largest measles outbreak New York City has seen in nearly three decades.
Measles outbreaks are typically declared over when two incubation periods for measles — which is about 42 days — have passed since the last day a person with measles is infectious in an affected area. That time period has now passed for the people most recently infected with measles and reported to the New York City Health Department, according to the city.
No new cases have been reported since mid-July, the city’s health department said, but officials will continue keeping track and may add cases retrospectively as they are identified. The city also could see future measles cases emerge that are not associated with this outbreak.
“Ending the measles outbreak required extensive collaboration with community organizations and Jewish leaders. They helped encourage vaccinations and achieve record immunization levels in parts of Brooklyn,” New York City Mayor Bill de Blasio said in a written statement on Tuesday.
“As we head back to school this week, we just remain vigilant. To keep our children and communities safe, I urge all New Yorkers to get vaccinated. It’s the best defense we have,” de Blasio said.
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