The city's Health Department is warning residents in Williamsburg and Borough Park about a bacterial outbreak.
According to health officials, there has been a jump in cases of Shigellosis, an infection from the Shigella bacteria that affects the intestines.
They say Shigellosis is fairly common, especially among young children, and most people recover on their own.
To help keep it from spreading, everyone is encouraged to wash their hands after using the bathroom or changing a diaper, and to keep sick children at home.