CALGARY As pandemic restrictions ease, administrators at Alberta universities and colleges are trying to figure out the safest way for staff and students to return to on-campus learning. University of Calgary professor and infections disease expert Craig Jenne knows the virus spreads indoors when people are close together for extended periods of time. And there s probably no better way to describe a university or college lecture hall than a whole bunch of people indoors for a long period of time, said Jenne. That poses a challenge for administrators. Seneca College in Toronto is the first post-secondary school in Canada to impose a new COVID rule where all staff and students must be fully vaccinated to come back to campus when school starts in the fall.