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Face shields don’t give high-level COVID protection, study shows

face shield
Credit: Unsplash/CC0 Public Domain

In the event that you wore a face shield through the pandemic, it probably didn’t provide you with a higher level of protection against COVID, in accordance with new research from the University of East Anglia.

A report published today compared 13 varieties of in controlled laboratory settings.

While all of the face shields provided some , none gave high degrees of protection against external .

And also studying face shields in the lab, the study team surveyed people including health workers in middle class countries (Brazil and Nigeria) about their views on face shields as PPE.

Prof. Paul Hunter, from UEA’s Norwich Medical School, said, “Face shields have already been popular since they don’t hinder breathing, they allow more natural communication than face masks plus they provide splash protection.

“These were trusted through the COVID pandemic. But as yet there was not a lot of evidence about how exactly protective they really areparticularly considering how people utilize them in real life, and especially in poorer elements of the planet.

“We wished to discover more about how protective different varieties of face shields may be, both in the lab and in real life settings.”

UEA researchers collaborated with staff at medical and Safety Executive (HSE), Britain’s regulator for workplace safe practices, who tested 13 face shield designs in a controlled laboratory setting, utilizing a “coughing machine” that ejected fluorescent drops onto mannequin heads.

Just how much the mannequin face was contaminated by the simulated cough droplets was graded from most to least.

Dr. Julii Brainard, from UEA’s Norwich Medical School, said, “The tests showed that of the facial skin shields provided some protection, but none gave high degrees of protection against external droplet contamination. The amount of protection provided was influenced by design features, and also which way the mannequin had its head turned when it had been ‘coughed’ at.

“We discovered that large gaps round the sides, and sometimes underneath or top, allow respiratory droplets from other folks to access the face which means contact with possible viruses.

“The shields that offered most protection were closed over the forehead and extended well round the sides of the facial skin and below the chin.

“It is critical to understand that the lab experiments come in the scenario of someone actively coughing at the shield wearer from close proximity. However the likelihood of droplets making your way around the shield onto the facial skin from just speaking are lower.”

For more information about how exactly face shields are employed in a genuine world setting, the team surveyed a lot more than 600 people across Nigeria and Brazil, including healthcare staff.

Dr. Brainard said, “We wished to find out about how users cleaned them, and things that mattered most whenever choosing facial PPE through the pandemic.

“And in addition, we discovered that people want proven protective products which are comfortable, stable on the head, an easy task to clean and that don’t look strange.

“This study is essential because acceptability of facial PPE through the has been mostly studied in richer countries just like the UK or U.S. The participants inside our study were in Nigeria and Brazil and we shouldn’t assume that folks in every countries view facial PPE just as.

“Additionally it is important to know very well what design features in face shields could possibly be pretty much protective, in order that people are in a position to choose the most reliable designs.

“Finally, we wished to understand how people cleaned reusable face shieldsmethylated or surgical spirits were popular, for example, but so was plain water and soap. Some cleaning chemicals could possibly be incompatible with shield coatings designed to prevent fogging or facilitate quick drying, for example. Dust outside and fogging inside shields were occasional problems, too,” she added.

A mixed methods study on effectiveness and appropriateness of face shield use as COVID-19 PPE in middle class countries’ is published in the journal American Journal of Infection Control on July 28, 2022.

In a related project, the HSE team tested face shields designed for use in the united kingdom. The results of the work, as well as additional information of the cough simulator, are published in the journal Annals of Work Exposures and Health.

Dr. Brian Crook, a microbiologist in the HSE team, said, “It is necessary that folks using any kind of PPE to safeguard themselves from infection understand how effective it really is, but additionally it’s limitations. We have been working with a global standards committee to create guidance towards an improved method of providing that information.”



More info: A mixed methods study on effectiveness and appropriateness of face shield use as COVID-19 PPE in middle class countries, American Journal of Infection Control (2022).

Citation: Face shields don’t give high-level COVID protection, study shows (2022, July 27) retrieved 28 July 2022 from https://medicalxpress.com/news/2022-07-shields-dont-high-level-covid.html

This document is at the mercy of copyright. Aside from any fair dealing for the intended purpose of private study or research, no part could be reproduced minus the written permission. This content is provided for information purposes only.

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