One tested COVID-19 positive. Five are out due to contact tracing. Since rooms and meals weren't ready when the officials arrived on Sunday, they (Ted Valentine, John Higgins, Roger Ayers, John Gaffney, Kipp Kissinger and Ray Natili) went out to eat and were exposed to the novel coronavirus.
https://www.si.com/college/2021/03/16/ncaa-tournament-refs-covid-protocols-march-madness
https://www.si.com/college/2021/03/16/ncaa-tournament-refs-covid-protocols-march-madness