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Officials say 57 confirmed and probable cases of the virus have been reported since August 21.

The outbreak was traced to a child who traveled to England, where the illness is more common. Officials believe that child infected others at a summer camp upstate.

The mumps outbreak continued in Borough Park once the school year began.

Cases ranged in age from 1 to 42 years old, but most have occurred in children ages 10 to 15.

Officials say three-quarters of the children who have come down with the mumps were vaccinated against it, which is supposed to protect against the illness 90 percent of the time. They stress the importance of getting vaccinated.

"If these children had not been vaccinated, if we didn't have as high a vaccination level as we do, we would likely be seeing many more cases,” said Dr. Jane Zucker of the New York City Department of Health.

Mumps is spread via large respiratory droplets. Any one in close contact with someone with the mumps runs the risk of catching it.

The infectious period is from two days before the onset of symptoms to five days after symptoms appear.

Symptoms include swelling and pain in the salivary glands, high fever, headache, earache, sore throat, difficulty swallowing, tiredness and aching in muscles and joints, and a loss of appetite and nausea.

Residents are being urged to report all possible cases of mumps to the Bureau of Immunization at (212) 676-2288 or x2284 or (212) 764-7667 after hours.