That order was overturned by a state judge on Friday, who said the reported number of cases fell short of an epidemic, local media reported. "We've seen a large increase in the number of people vaccinated in these neighborhoods, but as Passover approaches, we need to do all we can to ensure more people get the vaccine". "When people choose not to get their children vaccinated, they are putting their children and others - such as pregnant women, people on chemotherapy, and the elderly - at risk of contracting measles".
At a news conference, Dr Barbot said, of the 285 reported cases, 21 patients have been hospitalised and five had been admitted to an intensive care unit.
This is the largest outbreak in the city in almost three decades.
Mayor Bill de Blasio said individuals and parents who ignore the order will be fined up to $1,000 and that "disease detectives" would question them.
Measles "parties" stems from the once-popular trend of "pox parties" - intentionally exposing children to chickenpox, before the Varicella vaccine was rolled out in 1995. "The faster everyone heeds the order, the faster we can lift it".
Oxiris Barbot said on Tuesday that she is ordering everyone who lives, works or goes to school in Williamsburg to get vaccinated against the highly contagious disease.
"We can not allow this unsafe disease to make a comeback here in New York City", de Blasio added. "We have to stop it now".
News of the order got a mixed reaction among Orthodox Jews in Williamsburg, the Brooklyn neighborhood affected by the order. Now any school out of compliance will immediately be issued a violation and could be subject to closure.
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Insured adults and children will be covered.
De Blasio's vaccination order applies to all people, including children over six months old, who may have been exposed to the virus.
Anti-vaxxers have been specifically targeting the Orthodox Jewish community with misinformation. "All rabbis, all prominent rabbis have issued proclamations that everyone should vaccinate".
"In Judaism, the majority has the right to dictate what takes place in the public space to ward off danger".
"If people will simply cooperate quickly, nobody will have to pay a fine", de Blasio said.
Under the new rules, anyone who has not received the measles-mumps-rubella (MMR) vaccine or does not have evidence of immunity risks a fine of $1,000.
Like most American states - all but three, including California - New York requires a series of vaccinations for school-age children but has until now granted exemptions on both medical and religious grounds.
This is the largest outbreak of the measles that New York City has experienced since 1991, according to Barbot, and its spread represents a major spike over the two infections that plagued New Yorkers in 2017.
The majority of religious leaders in Brooklyn's large Orthodox communities support vaccination efforts, said the city's health commissioner, Dr Oxiris Barbot, but rates have remained low in some areas because of resistance from some groups that believe the inoculations are unsafe.