Submitted by mike kraft on Mon, 2023-10-30 10:39 Face mask effectiveness: What science knows now Does wearing a face mask help to prevent COVID? Three and a half years after the pandemic began, here's what scientists have learned. CBS News Country / Region Tags: GlobalGeneral Topic Tags: COVID-19ContagionDisease PreventionMasksPublic HealthResearchScienceProblem, Solution, SitRep, or ?: AnalysisGroups this Group Post belongs to: - Private group - Log in or register to post comments