An increase in coronavirus cases in southwest Wyoming is connected to a public gathering where social distancing rules were not followed, a state health official said.

The addition of three cases Tuesday brings Uinta County to 80 confirmed coronavirus infections, the state’s third highest total, The Casper Star-Tribune reports.

Dr. Alexia Harrist, the state health officer, said the new cases appear to be connected to a gathering at a public location, which she declined to identify except to say it involved young people.

People at the gathering spread the virus to others who did not attend, Harrist said.

The new cases include health care workers, which Harrist said can produce multiple unintended effects.

“This situation illustrates how it doesn’t take much to really change the disease picture within a community,” she said.

Republican Gov. Mark Gordon, appearing with Harrist, said Wyoming has 237 active cases, although at one time the number had fallen below 200.

For most people, the new coronavirus causes mild or moderate symptoms, such as fever and cough that clear up in two to three weeks. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia and death. The vast majority of people recover.