Efficacy of cloth face mask in prevention of novel coronavirus infection transmission: A systematic review and meta-analysis.
J Educ Health Promot. 2020 Jul 28;9:192. doi: 10.4103/jehp.jehp_533_20. eCollection 2020. (Free full text)
RESULTS: Cloth face masks show minimum efficacy in source control than the medical grade mask. The efficacy of cloth face masks filtration varies and depends on the type of material used, number of layers, and degree of moisture in mask and fitting of mask on face.
CONCLUSION: Cloth face masks have limited efficacy in combating viral infection transmission. However, it may be used in closed, crowded indoor, and outdoor public spaces involving physical proximity to prevent spread of SARS-CoV-2 infection.