There have been 181 confirmed cases of measles in Brooklyn and Queens since October a year ago, majority involving members of the Orthodox Jewish community, according to the CDC. Of those, 48 have occurred in 2019.
Lyon said that the ban will be enforced not by proactively interrogating people in public places, but if an incident of measles infection is traced back to an area in which an unvaccinated minor was present.
Schools, houses of worship, shopping malls in Rockland County - anywhere that people who are not related to one another congregate indoors - will be off limits for unvaccinated children, officials said.
An outbreak in New York City also has mostly affected haredi Orthodox communities, where vaccination rates tend to be lower and anti-vaccination literature has spread, the Times reported citing public health officials.
Almost 17,000 vaccinations have been administered in the county during the outbreak.
The declaration is an effort to contain an outbreak of measles that began in October; 153 cases have been confirmed in the county.
"It's an attention grabber, there's no question about it", Day said.
Health officials said the best way to stop the disease's spread was a high vaccination rate in the community, and imposed the ban for 30 days. "Our health inspectors have been hung up on, or told not to call again".
The declaration of emergency has faced a pushback from the anti-vaxx movement, while some criticized the measure as a step towards a police state. "It endangers the health and well-being of others and displays a shocking lack of responsibility and concern for others in our community", Day said.
Measles cases have increased in recent years in part because of fears fanned by anti-vaccine activists, according to Kaiser Health News. "Law enforcement will not be patrolling or asking for vaccination records, but those found to be in violation will be referred to the Rockland County District Attorney's Office", reads the announcement from Day's office. Some 145 cases come from Orange and Rockland counties with 64 cases found in Brooklyn. "We want to encourage people to get vaccinated", he said.
Anyone told by a health care provider to "watch for measles" after possible exposure is advised to stay home and not go out in public, where they could expose others.
"I'll be interested to see how many people come forward to get vaccinated", she said, agreeing that social scientists will probably be watching this natural experiment closely.
"We want people to be able to celebrate", he said.