BROOKLYN - The Department of Health is holding a free vaccination campaign starting Wednesday to help contain the mumps outbreak that continues to spread in Brooklyn.

The New York City Health Department says they have had over 900 confirmed cases of the mumps and are still investigating 300 cases. The disease has been spreading among Orthodox Jews in Borough Park, Crown Heights and Williamsburg.

The agency hopes to vaccinate thousands of people during the two-day campaign. The free clinics will be held in Williamsburg on Wednesday and in Borough Park on Thursday.