An outbreak of the mumps continued to spread at a ski resort in Summit County, Colorado.

According to Summit County Public Health, three new cases of mumps have been confirmed among employees at Keystone Resort in Summit County, raising the overall outbreak to a total of six cases.

As the ski season continues, Summit County Public Health and the Colorado Department of Public Health and Environment will continue to work together to further investigate the outbreak and provide support to Vail Resorts in an effort to slow the spread of disease. Seeing additional cases among this population or close contacts is not unexpected.

“Keystone Resort has been fully cooperating and closely coordinating with Summit County Public Health to support affected employees and protect all staff and the public,” said Sara Lopez, nursing manager for Summit County Public Health.

Summit Country Public Health says mumps is a viral infection that causes painful swelling in the glands of the cheek and jaw. Other symptoms include low-grade fever, tiredness, loss of appetite and headache. A third of people infected do not experience any symptoms. While rare, other symptoms may include swollen testicles, infection in the spinal fluid or brain, and loss of hearing.

Summit County is no stranger to the mumps. In May of 2019, six cases of mumps were confirmed among employees at Arapahoe Basin Ski Area.

Health officials are asking people who have symptoms of mumps to consult with their health care provider or call Summit County Public Health at 970-668-9161.

For information about mumps data in Colorado, visit

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