The initial child with measles was unvaccinated and acquired measles on a visit to Israel, where a large measles outbreak is occurring. Since then, there have been more people from Brooklyn and Queens who were unvaccinated and acquired measles while in Israel, according to the city’s health department. People who did not travel were also infected in Brooklyn or Rockland County, where there is also a measles outbreak occurring.

Source: Los Angeles Times March 21, 2019 05:03 UTC