Mumps outbreak strikes Orthodox Jews in N.Y.

More than 300 people, nearly all Orthodox Jews and Chasidim, have contracted the mumps in an upstate New York county.

The cases broke out in Monsey and New Square in Rockland County, about 25 miles from New York City, and have spread to Brooklyn and New Jersey Orthodox Jewish communities, according to The Journal News.

The outbreak started in August in a summer camp in the Catskills for Orthodox Jewish boys. Twenty-five campers came down with the illness, the Centers for Disease Control told the newspaper.

Many of those affected were vaccinated against the mumps.