Department of Mathematics and Statistics professor Monica Cojocaru [1] and team found that randomly testing students for COVID-19 could control outbreaks.
https://news.uoguelph.ca/2021/01/regular-covid-19-tests-for-students-cou... [2]
See also link below for podcast interview with Dr. Cojocaru.
https://www.iheartradio.ca/610cktb/audio/professor-monica-gabriela-cojoc... [3]