How Much Does Wearing a Mask Protect You?

Henning Bundgaard, PhD, cardiologist, Copenhagen University Hospital, Copenhagen, Denmark.

F. Perry Wilson, MD, associate professor, Yale University; director, Clinical and Translational Research Accelerator, New Haven, CT.

Linsey Marr, PhD, professor of civil and environmental engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA.

Christine Laine, MD, editor-in-chief, Annals of Internal Medicine; clinical associate professor, internal medicine, Jefferson University Hospitals, Philadelphia.

John Brooks, MD, medical epidemiologist, Division of HIV/AIDS Prevention, CDC, Atlanta.

Annals of Internal Medicine: “Effectiveness of Adding a Mask Recommendation to Other Public Health Measures to Prevent SARS-CoV-2 Infection in Danish Mask Wearers.”