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This review found that a face mask made of double layered tea towel fabric had a filtration efficiency of 97%, which is similar to filtration achieved by a surgical face mask. Ann Intern Med . 2020 May 22.    (retrieved Jun, 2020). There are currently 1090 pearls in the database. While every attempt has been made to ensure accuracy, mistakes can and do occur. Use databank at your own risk. All pearls © 2024 by the Internet Medical Association. Click Here to view more medical pearls.