The University of Idaho reported another 116 new coronavirus cases on campus last week.

The outbreak still seems to be centered on fraternity and sorority houses.

“The live-in Greek chapters continue to be the primary source of the positives and (four times) more infected than other students living on campus,” the U of I said on its coronavirus website Monday. “There is little to no infection across the off-campus students and employees.”

The latest numbers cover tests completed through Friday.

A week ago, the U of I reported 67 new cases.

While the case numbers continued to climb last week, the university’s positive test rate dropped from about 12 percent to about 8 percent. That’s still higher than a 5 percent positive test rate — which health experts consider a sign of adequate testing. In the past week, however, the U of I expanded its testing from Greek houses to surveillance testing of the university community.

The U of I is continuing face-to-face instruction, but has given professors the option of moving classes online, the U of I Argonaut reported Friday.