State heath officials say three cases have recently been diagnosed.
Dora Anne Mills of the Maine Center for Disease Control says there’s no common connection among the three infected adults, and there are probably others in Maine who have the contagious viral disease.
In addition to flu-like symptoms, mumps causes swelling in the salivary glands.
There’s no specific treatment, and those who have the disease are advised to get plenty of rest and drink a lot of fluids.
Mills theorized that those who contracted mumps may have failed to receive the recommended second vaccination.
It has been 12 years since Maine has seen a case of mumps.