MASKS VS MASK MANDATES: This thread will explore the data on masks & may be why media now turning to idea that one-way masking with good, fit/filtered masks for those who choose to mask may work better than mask mandates which were almost universally applied (will try to explain

— Monica Gandhi MD, MPH (@MonicaGandhi9) April 21, 2022

Good thread. Bottom line: cloth masks don’t do much. KN95 or better masks with proper fit protect even when no one else is masking. And mask mandates are mostly worthless.