She also blamed the crisis on a small group of people in Williamsburg who are opposed to vaccinations.
"'They have been spreading dangerous misinformation based on fake science," she said, according to the news station.
Mayor Bill de Blasio’s spokesman, Eric Phillips, said measles vaccinations for those who may have been exposed are mandatory.
“And we’ll shut down schools violating the ban on unvaccinated students,” Phillips said.
City officials cannot force anyone to get vaccinated, WPIX reported, but they can fine people who refuse a vaccine order.
“If people will simply cooperate quickly, nobody will have to pay a fine,” de Blasio said.
New York is battling the worst measles outbreak since 1991 with some 285 confirmed cases.