EVIDENCE | EBM PICO(T) Q: … “What Does The Medical Evidence and Literature Say About the Safety for Healthcare Professionals Using Cloth Fabric Materials as Protective Measures for Filtration and Protection from Common Particles and Viral Infections?”

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Question

“What Does The Medical Evidence and Literature Say About the Safety for Healthcare Professionals Using Cloth Fabric Materials as Protective Measures for Filtration and Protection from Common Particles and Viral Infections?”

Link(s) to Relevant Study(s)

  1. Published: February 24, 2020; Clinical course and outcomes of critically ill patients with SARS-CoV-2 pneumonia in Wuhan, China: a single-centered, retrospective, observational study; Xiaobo Yang, MD †Yuan Yu, MD †Jiqian Xu, MD †Prof Huaqing Shu, MD †Prof Jia’an Xia, MD †Prof Hong Liu, MD †et al. Show all authors; Show footnotes; DOI: https://doi.org/10.1016/S2213-2600(20)30079-5; https://www.thelancet.com/journals/lanres/article/PIIS2213-2600(20)30079-5/fulltext

Summary (or Screen Shot) of Relevant Data Specific to Question

  • Simple Respiratory Protection—Evaluation of the Filtration Performance of Cloth Masks and Common Fabric Materials Against 20–1000 nm Size Particles; To address the filtration performance of common fabric materials against nano-size particles including viruses, five major categories of fabric materials including sweatshirts, T-shirts, towels, scarves, and cloth masks were tested for polydisperse and monodisperse aerosols (20–1000 nm) at two different face velocities (5.5 and 16.5 cm s−1) and compared with the penetration levels for N95 respirator filter media. The results showed that cloth masks and other fabric materials tested in the study had 40–90% instantaneous penetration levels against polydisperse NaCl aerosols employed in the National Institute for Occupational Safety and Health particulate respirator test protocol at 5.5 cm s−1. Similarly, varying levels of penetrations (9–98%) were obtained for different size monodisperse NaCl aerosol particles in the 20–1000 nm range. The penetration levels of these fabric materials against both polydisperse and monodisperse aerosols were much higher than the penetrations for the control N95 respirator filter media. At 16.5 cm s−1 face velocity, monodisperse aerosol penetrations slightly increased, while polydisperse aerosol penetrations showed no significant effect except one fabric mask with an increase. Results obtained in the study show that common fabric materials may provide marginal protection against nanoparticles including those in the size ranges of virus-containing particles in exhaled breath. This article was originally published in The Annals of Occupational Hygiene, Volume 54, Issue 7, October 2010, Pages 789–798, https://doi.org/10.1093/annhyg/meq044

Evidenza | Call to Action FOR DOCTORS

“Physicians, Urgent Care Centers, Retail Healthcare Facilities and Hospitals should prepare, stock and have immediately available protective supplies for all Healthcare Workers and have readily available a supply line to provide and order more.”

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