Peter Chin-Hong, MD, professor of medicine and infectious disease specialist, University of California, San Francisco.

Katelyn Jetelina, PhD, MPH, San Diego epidemiologist; publisher, Your Local Epidemiologist.

William Schaffner, MD, professor of infectious diseases, Vanderbilt University Medical Center, Nashville.

Eric Topol, MD, founder and director, Scripps Translational Research Institute, La Jolla, CA, editor-in-chief,  Medscape.

CDC: “Wearing Masks in Travel and Public Transportation Settings.”

The School District of Philadelphia: “A Holiday Message from Dr. Watlington.”

The White House: “Biden Administration Announces COVID-19 Winter Preparedness Plan.”

Advisory: Commissioner of Health and Mental Hygiene of the City of New York.

The New England Journal of Medicine: “Lifting Universal Masking in Schools—Covid-19 Incidence among Students…


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