BEND, Ore. (AP) — More than 20 people have tested positive for COVID-19 at the Mt. Bachelor Memory Care center in Bend, health officials said.

After four days of testing staff and residents, contact tracers are working to determine the origin of the infection, according to Deschutes County Health Services director Dr. George Conway. One person tested positive on Saturday, The Bulletin reported.

Over the weekend, county health officials started testing residents and staff as they came to work. Conway says not all the test results are in. He says most who have tested positive are residents along with some workers.

None of the people who have tested positive are clinically ill or needing hospitalization, Conway said.

Now that a positive case has been identified there, new residents will not be accepted and additional limits will be placed on visitors, according to the human services website.

“The residents are struggling,” facility executive director Mallory DaCosta said. “They don’t always want to wear masks. The staff is devastated.”

As of Wednesday, there have been nearly 13,100 COVID-19 cases in Oregon, and at least 247 Oregonians have died from the virus, health officials said.

The virus causes mild to moderate symptoms in most patients, and the vast majority recover. But it is highly contagious and can cause severe illness and death in some patients, particularly the elderly and those with underlying health conditions.