This year, Colorado has already seen 14 cases of the mumps, which nearly matches the state's 2016 total of 17.
Eleven of the 14 cases occurred in the Denver metropolitan area and are being investigated as an outbreak by the Colorado Department of Public Health and Environment, Denver Public Health and Tri-County Health Department.
The CDC reported a 10-year high in mumps cases nationwide in 2016.
Sign up for our FREE E-Weekly for more coverage like this sent to your inbox!
"Because of the high numbers of mumps cases across the country, it is especially important to make sure your children are vaccinated," said Rachel Herlihy, MD director of the disease control and environmental epidemiology division at the Colorado Department of Public Health and Environment. "Both adults and children should make sure they are up to date on their mumps vaccine."
Two doses of the mumps, measles and rubella vaccine are 88 percent effective at preventing the mumps, according to the CDC.
More articles on infection control:
Trump's Mexico City Policy expansion and what it could mean for the fight against Zika, HIV: 3 things to know
Environmental cleaning approaches for reducing MRSA transmission: 5 study insights
CDC links 2016 multistate E. coli outbreak to dessert pizza dough