Transmission of the virus can be dramatically reduced by well-fitted masks or double-masking, according to new research by the C.D.C. https://ift.tt/2Z1HGvt World New York Times February 9, 2021 at 07:00PMThe C.D.C. says tight-fit masks or double masking with cloth and surgical masks increases protection.

By Roni Caryn Rabin and Sheryl Gay Stolberg from NYT World https://ift.tt/2Z1HGvt
https://ift.tt/2Z1HGvt New York Times