Dr. Brosseau is a national expert on respiratory protection and infectious diseases and professor (retired), University of Illinois at Chicago. Dr. Sietsema is also an expert on respiratory protection and an assistant professor at the University of Illinois at Chicago. _____________________________________ Editor’s Note: The authors added the following statement on Jul 16. The authors and CIDRAP have received requests … Continue reading Masks-for-all for COVID-19 Not Based on Sound Data