UNIVERSITY OF CINCINNATI IMAGE: AHMAD SEDAGHAT, M.D., PH.D., SHOWN AT THE UNIVERSITY OF CINCINNATI GARDNER NEUROSCIENCE INSTITUTE. CREDIT: COLLEEN KELLEY/UNIVERSITY OF CINCINNATI As COVID-19 restrictions ease nationwide and more people host indoor gatherings, investing in a high-efficiency particulate air (HEPA) purifier might not be a bad idea, says a University of Cincinnati College of Medicine...