Thomas A. Russo, MD, SUNY Distinguished Professor of
medicine and chief of the
Division of Infectious Diseases in the Jacobs School, told
Prevention that there’s no hard and fast rule on how many times N95 and KN95 masks can be used. In pre-pandemic times, when N95 respirators were mostly used by health care and construction workers, they were tossed after one use. “Initially, people would say that these types of masks were one and done,” said Russo. “But now, given pandemic shortages, that’s not very pragmatic.”