There were only two reported cases in 2017.
"This is the epicenter of a measles outbreak that is very, very troubling and must be dealt with immediately..."
The measles virus is highly contagious and can lead to serious complications and death. The disease can be prevented through vaccination.
"Since then, there have been additional people from Brooklyn and Queens who were unvaccinated and acquired measles while in Israel", according to the city's health department. People who ignore the order could be fined $1,000.
New York City officials declared a public health emergency Tuesday in parts of the Williamsburg neighborhood, where a measles outbreak has run rampant in an Orthodox Jewish community since last October-largely among unvaccinated children.
Community leader Abe Friedman said he supported the city's move.
Mainstream Jewish teaching does not prohibit vaccination, and most rabbis are encouraging parents to have their children immunized. "The schools are cooperating, everyone's cooperating". "I've seen some mailings", Schlesinger said. "They will do anything and everything to improve the health of their children".
The recent outbreak is one of many measles outbreaks that have hit the city since the fall.
Another outbreak has hit Orthodox Jewish families in New York's Rockland County.
That order was overturned by a state judge on Friday, local media reported. The other locations include areas of Washington state and Michigan, Butte County and Santa Cruz County in California, Rockland County in NY, and Ocean County in New Jersey.
Many vaccine opponents believe medically baseless claims that inoculations can cause autism and other negative health effects.
City officials also expressed alarm at reports of parents holding "measles parties", where they intentionally expose their unvaccinated children to an infected child in the mistaken belief doing so is a safe means to create immunity. Of those infected, 246 were children, NY health commissioner Oxiris Barbot said. She added that the city will help unprotected individuals secure affordable and accessible vaccination, and emphasized that vaccination is safe and effective.