Experimental Efficacy of the Face Shield and the Mask against Emitted and Potentially Received Particles.
Int J Environ Res Public Health
; 18(4)2021 02 17.
Artículo
en Inglés
| MEDLINE | ID: covidwho-1110412
Preprint
Este artículo de revista científica es probablemente basado en un preprint previamente disponible, por medio del reconocimiento de similitud realizado por una máquina. La confirmación humana aún está pendiente.
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Este artículo de revista científica es probablemente basado en un preprint previamente disponible, por medio del reconocimiento de similitud realizado por una máquina. La confirmación humana aún está pendiente.
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ABSTRACT
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.
Palabras clave
Texto completo:
Disponible
Colección:
Bases de datos internacionales
Base de datos:
MEDLINE
Asunto principal:
Control de Enfermedades Transmisibles
/
Exposición por Inhalación
/
Equipo de Protección Personal
/
COVID-19
/
Máscaras
Tipo de estudio:
Estudio experimental
Límite:
Humanos
Idioma:
Inglés
Año:
2021
Tipo del documento:
Artículo
País de afiliación:
Ijerph18041942
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