The effectiveness of a mask—how much protection a mask provides the wearer—is a combination of two major elements. First, there’s the ability of the material to capture particles.

In the test, exposure decreased by about 95% when both were wearing tight-fitting masks.On a call with school nurses on Wednesday, state health leaders said the CDC study is based on lab research ...

In laboratory testing, wearing a disposable mask underneath a cloth mask was shown to substantially improve protection against exposure and transmission of the virus.

In lab tests with dummies, exposure to potentially infectious aerosols decreased by about 95 percent when they both wore tight-fitting masks, according to the study. Other effective options to ...

I mean, it just says KN95 on the side. Collins: And that’s kind of the problem. The test standard is kind of specific as to the labeling of the mask.

Transmission of the virus can be dramatically reduced by well-fitted masks or double-masking, according to new research by the C.D.C. transcript Dr. Rochelle P. Walensky, director of the Centers ...