Jews might be dealing with an 11th plague this Passover — the mumps.

A special health advisory released this month cautions Hasidic Jews about spreading the disease over the holiday, which starts tomorrow night.

The warning from the Centers for Disease Control and Prevention also suggests doctors offer a second dose of the vaccine to adults who already received one.

A mumps outbreak among New York and New Jersey Orthodox Jews has surpassed 1,500 cases, the CDC announced. It started last summer at a boys’ camp in upstate Sullivan county, with the first case traced to an 11-year old boy who had just come from Britain, where vaccination rates are lower.

Anyone exhibiting the common symptoms of fever, headache and swollen glands should be isolated for five days, the CDC advises.

Most of the Jewish campers had mumps vaccinations, but shots don’t prevent all cases, according to the CDC. The mumps vaccine is 79 to 95 percent effective if two doses are given.