As students head back to school, parents and teachers are increasingly concerned about how the coronavirus could spread — especially in buildings with inadequate ventilation. John Lednicky studies viruses at the University of Florida. "There was a lot of controversy about SARS-CoV-2 being transmitted or not being transmitted through airborne routes," Lednicky told CBS News. Analyzing air samples in a hospital room, Lednicky's team found infectious virus can spread through the air — up to 16 feet away from an infected patient — through tiny droplets called aerosols.