Effectiveness of Surgical and Cotton Masks in Blocking SARS-CoV-2: A Controlled Comparison in 4 Patients

Affiliations

• ¹ Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea (S.B., J.Y.K., H.C., J.J., M.K., D.K.O., S.H., S.K.).
• ² Chung-Ang University Hospital, Seoul, South Korea (M.K., M.L., S.C., J.C.).
• ³ Clinical Research Center, Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea (J.S.L.).
• ⁴ Sejong University, Seoul, South Korea (M.S.).