Can KN95 masks protect against viruses?

KN95 masks can protect against viruses. KN95 masks follow the Chinese standard, which requires both particulate filtration efficiency and bacterial filtration efficiency to exceed 95%, with particularly strict requirements for filtering 0.3-micron particles. KN95 masks also have specific requirements regarding breathing resistance, moisture absorption, and residual bacteria levels after ultraviolet disinfection; these standards ensure that the mask's filtration efficiency and breathability meet established criteria. KN95 masks offer a level of protection comparable to N95 medical respirators, effectively filtering viruses in the air and preventing them from entering the body, thus providing preventive protection. Therefore, KN95 masks can be used for virus protection.