Ideally, everyone (not just medical workers) should be using a KN95 or N95 mask for optimal protection when COVID cases are high or when there's a contagious variant like Omicron, according to the ...
N95 face masks can block more than 95 percent of microparticles ... particularly tracheal suction, dental or other treatment that exposes them to aerosols in exhaled breath of patients who may ...