Neighborhood officials said the vast majority of Orthodox Jews in Williamsburg are vaccinated, but because the community is so tightly knit, just a small number of anti-vaxers is allowing this outbreak to grow, CBS2's Ali Bauman reported Monday.

"There is no religious exemption on measles," said Gary Schlesinger, CEO of Parcare Community Health Network. "All rabbis, all prominent rabbis have issued proclamations that everyone should vaccinate."

Schlesinger is trying to reverse false information being spread about the measles vaccine through the Orthodox community.

"They're spreading this information through hotlines, some publications. I've seen some mailings," Schlesinger said.

Since the measles outbreak began in October, the Department of Health says there have been 285 reported cases in Brooklyn's Orthodox Jewish community, 246 of which are children. And so far, 21 people have been hospitalized.