How Much Does Wearing a Mask Protect You? A Look at the Danish Study on Masks

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

F. Perry Wilson, MD, associate teacher, Yale University; supervisor, Clinical and also Translational Research Accelerator, New Haven, CT.

Linsey Marr, PhD, teacher of civil and also ecological design, Virginia Polytechnic Institute and also State University, Blacksburg, VA.

Christine Laine, MD, editor-in-chief, Annals of Internal Medicine; medical associate teacher, interior medication, Jefferson University Hospitals, Philadelphia.

John Brooks, MD, clinical 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.”