This is a maximum 10-week (8-week intervention+2-week follow up) two-armed controlled study to investigate efficacy of Acteev™ system (Acteev™ N95 masks YQD8008 during shifts+ Acteev™ fabric masks in community) compared with standard system (standard N95 masks during shifts+ fabric masks in community) in HCWs working in high-risk hospital wards (ICU, emergency), against the prevention of SARS CoV-2 infection. Prospective HCWs will be identified for the study by the study investigator/study team and be invited for participation in the study. All study procedures will begin only after obtaining written informed consent from the subjects. Subjects will be randomized in one of the two arms mentioned below after meeting all the study eligibility criteria: Arm 1:Acteev™ system (Acteev™ N95 masks YQD8008 during shifts+ Acteev™ fabric masks in community) Arm 2: Standard system (standard N95 masks during shifts+ fabric masks in community).
