MADISON, Wis. (AP) — The University of Wisconsin-Madison has warned of a recent spike in COVID-19 cases.

The university health services email came Friday, a day after a more contagious variant was detected in the county.

Jake Baggott, the head of University Health Services, warned of a “significant increase” in COVID-19 cases among students on and off campus. He says there were 112 confirmed cases reported Wednesday and 99 more on Thursday.

UW President Tommy Thompson said Thursday that he directed chancellors to ensure that students at every campus could attend at least 75% of classes in person this fall, citing a low infection rate in the system’s schools.