Association Between Universal Masking in a Health Care System and SARS-CoV-2 Positivity Among Health Care Workers

JAMA. 2020 Jul 14;324(7):703-704. doi: 10.1001/jama.2020.12897. Online ahead of print.


This study describes SARS-CoV-2 PCR test positivity among health care workers before, during, and after implementation of a policy requiring universal masking of all health care workers and patients in a large health care system in Massachusetts.