The New York City Health Department is warning about a measles outbreak in Brooklyn.
At least 22 cases have been reported this year, with 21 in Borough Park and one in Williamsburg.
According to DNAInfo.com, the cases have been concentrated within Brooklyn's ultra-orthodox Jewish community, and health officials are concerned that many more people have been exposed.
Measles symptoms include rash, high fever, cough, runny nose and red, watery eyes.
The disease is highly contagious and potentially deadly, though it can be prevented by receiving a vaccination.