CASPER, Wyo. (AP) — An employee at the University of Wyoming has contracted the coronavirus, the schools says, marking the first time someone living or working on campus has tested positive.

The school in a statement Friday said the man went into self-isolation on July 3 when he began feeling symptoms. He said he believes he contracted the virus at a private appointment off-campus.

Officials told the Casper Star-Tribune that “there is little campus exposure risk.”

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.

According to a tally by Johns Hopkins University, Wyoming on Saturday had 1,839 confirmed cases and 21 deaths due to the virus.

The number of infections is thought to be far higher because many people have not been tested, and studies suggest people can be infected with the virus without feeling sick.