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Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles
There is currently not sufficient evidence to support the effectiveness of face shields for source control. In order to evaluate the comparative barrier performance effect of face masks and face shields, we used an aerosol generator and a particle counter to evaluate the performance of the various d...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7922468/ https://www.ncbi.nlm.nih.gov/pubmed/33671300 http://dx.doi.org/10.3390/ijerph18041942 |
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author | Wendling, Jean-Michel Fabacher, Thibaut Pébaÿ, Philippe-Pierre Cosperec, Isabelle Rochoy, Michaël |
author_facet | Wendling, Jean-Michel Fabacher, Thibaut Pébaÿ, Philippe-Pierre Cosperec, Isabelle Rochoy, Michaël |
author_sort | Wendling, Jean-Michel |
collection | PubMed |
description | There is currently not sufficient evidence to support the effectiveness of face shields for source control. In order to evaluate the comparative barrier performance effect of face masks and face shields, we used an aerosol generator and a particle counter to evaluate the performance of the various devices in comparable situations. We tested different configurations in an experimental setup with manikin heads wearing masks (surgical type I), face shields (22.5 cm high with overhang under the chin of 7 cm and circumference of 35 cm) on an emitter or a receiver manikin head, or both. The manikins were face to face, 25 cm apart, with an intense particle emission (52.5 L/min) for 30 s. The particle counter calculated the total cumulative particles aspirated on a volume of 1.416 L In our experimental conditions, when the receiver alone wore a protection, the face shield was more effective (reduction factor = 54.8%), while reduction was lower with a mask (reduction factor = 21.8%) (p = 0.002). The wearing of a protective device by the emitter alone reduced the level of received particles by 96.8% for both the mask and face shield (p = NS). When both the emitter and receiver manikin heads wore a face shield, the protection allowed for better results in our experimental conditions: 98% reduction for the face shields versus 97.3% for the masks (p = 0.01). Face shields offered an even better barrier effect than the mask against small inhaled particles (<0.3 µm–0.3 to 0.5 µm–0.5 to 1 µm) in all configurations. Therefore, it would be interesting to include face shields as used in our experimental study as part of strategies to reduce transmission within the community setting. |
format | Online Article Text |
id | pubmed-7922468 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79224682021-03-03 Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles Wendling, Jean-Michel Fabacher, Thibaut Pébaÿ, Philippe-Pierre Cosperec, Isabelle Rochoy, Michaël Int J Environ Res Public Health Article There is currently not sufficient evidence to support the effectiveness of face shields for source control. In order to evaluate the comparative barrier performance effect of face masks and face shields, we used an aerosol generator and a particle counter to evaluate the performance of the various devices in comparable situations. We tested different configurations in an experimental setup with manikin heads wearing masks (surgical type I), face shields (22.5 cm high with overhang under the chin of 7 cm and circumference of 35 cm) on an emitter or a receiver manikin head, or both. The manikins were face to face, 25 cm apart, with an intense particle emission (52.5 L/min) for 30 s. The particle counter calculated the total cumulative particles aspirated on a volume of 1.416 L In our experimental conditions, when the receiver alone wore a protection, the face shield was more effective (reduction factor = 54.8%), while reduction was lower with a mask (reduction factor = 21.8%) (p = 0.002). The wearing of a protective device by the emitter alone reduced the level of received particles by 96.8% for both the mask and face shield (p = NS). When both the emitter and receiver manikin heads wore a face shield, the protection allowed for better results in our experimental conditions: 98% reduction for the face shields versus 97.3% for the masks (p = 0.01). Face shields offered an even better barrier effect than the mask against small inhaled particles (<0.3 µm–0.3 to 0.5 µm–0.5 to 1 µm) in all configurations. Therefore, it would be interesting to include face shields as used in our experimental study as part of strategies to reduce transmission within the community setting. MDPI 2021-02-17 2021-02 /pmc/articles/PMC7922468/ /pubmed/33671300 http://dx.doi.org/10.3390/ijerph18041942 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Wendling, Jean-Michel Fabacher, Thibaut Pébaÿ, Philippe-Pierre Cosperec, Isabelle Rochoy, Michaël Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles |
title | Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles |
title_full | Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles |
title_fullStr | Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles |
title_full_unstemmed | Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles |
title_short | Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles |
title_sort | experimental efficacy of the face shield and the mask against emitted and potentially received particles |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7922468/ https://www.ncbi.nlm.nih.gov/pubmed/33671300 http://dx.doi.org/10.3390/ijerph18041942 |
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