GRAND JUNCTION, Colo. (KJCT) -Two measles cases have been confirmed in Mesa County. It’s the first time any have been confirmed in the county in over 20 years. According to Mesa County Public Health, there’s a lack of a clear source of infection for the cases. They said it suggests a community transmission in Grand Junction.

Officials from the CDPHE warned about a possible measles exposure at Denver International Airport in Concourse C.

The Wisconsin Department of Health Services says people at two public locations may have been exposed to measles by a traveler from out of state. Anyone who was at the locations below during the following dates and times should check to see if they have had the measles vaccine:

Mesa County is now dealing with its second confirmed case of measles in just a matter of days, following over a 20-year span without a confirmed case.

Each province and territory has its own vaccine schedule based on factors such as when a child would benefit from higher immunity from the shot.

CBS News is tracking a record number of measles cases around the country after an outbreak in West Texas that led to the deaths of two children.