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.
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Cochrane Database Syst Rev. 2020 Nov 5;11:CD013779. (Free Full Text - Reminder: NH Library also has the FULL text of the complete Cochrane Database of Systematic Reviews for other content you may need).
This paper presents an overview and comparative analysis of the epidemiological situation and the policy responses in France, Belgium, and Canada during the early stages of the 2020 Covid-19 pandemic (Feb.-Aug. 2020). These three countries are compared because they represent a spectrum of different governance structures while also being OECD nations that are similar in many other respects.