Wednesday, November 25, 2020
Home Life Style Health & Fitness Covid-19: Wearing Face Shields, N-95 Masks Together May Not Stop Virus

Covid-19: Wearing Face Shields, N-95 Masks Together May Not Stop Virus

People wearing face shields along with N-95 masks can easily get the deadly coronavirus

As we anguish after witnessing millions of Indians not wearing face masks or wearing them all wrong in public places amid surge in Covid-19 figures, a study led by Indian-American researchers has warned that even people wearing the combination of face shields along with masks with exhalation valves are not safe and can easily get the deadly coronavirus.

When someone carrying the Covid-19 virus coughs, aerosolised droplets expelled with the jet are able to move around the face shield visor with relative ease.

“Over time, these droplets can disperse over a wide area in both lateral and longitudinal directions, albeit with decreasing droplet concentration,” said Manhar Dhanak, department chair, professor and director of SeaTech at Florida Atlantic University (FAU).

Follow NewsGram on Quora Space to get answers to all your questions.

“We were able to observe that face shields are able to block the initial forward motion of the exhaled jet, however, aerosolised droplets expelled with the jet are able to move around the visor with relative ease,” added Dhanak who co-authored the paper with Siddhartha Verma, lead author and John Frankenfeld, a technical professional at FAU’s Department of Ocean and Mechanical Engineering.

'Even face shield, N-95 mask together can't stop coronavirus'
When someone carrying the Covid-19 virus coughs, aerosolised droplets expelled with the jet are able to move around the face shield visor with relative ease. Pixabay

The N95-rated face mask with the exhale valve used in this study had a small amount of exhaled droplets that escaped from the gap between the top of the mask and the bridge of the nose.

Moreover, the exhalation port significantly reduced the effectiveness of the mask as a means of source control, as a large number of droplets passed through the valve unfiltered and unhindered, said the study published in the journal Physics of Fluids.

“There is an increasing trend of people substituting regular cloth or surgical masks with clear plastic face shields as well as using masks that are equipped with exhalation valves,” said Verma.

Want to read more in Hindi? Checkout: ‘अभिव्यक्ति की आज़ादी’ और इससे जुड़े पहलुओं पर विस्तार में चर्चा 

A driving factor for this increased adoption is better comfort compared to regular masks.

“However, face shields have noticeable gaps along the bottom and the sides, and masks with exhalation ports include a one-way valve which restricts airflow when breathing in, but allows free outflow of air. The inhaled air gets filtered through the mask material, but the exhaled breath passes through the valve unfiltered,”

Verma explained.

For the study, researchers employed flow visualisation in a laboratory setting using a laser light sheet and a mixture of distilled water and glycerine to generate the synthetic fog that made up the content of a cough-jet.

They visualised droplets expelled from a mannequin’s mouth while simulating coughing and sneezing.

'Even face shield, N-95 mask together can't stop coronavirus'
The expelled droplets move around the visor with relative ease and spread out over a large area depending on light ambient disturbances. Pixabay

By placing a plastic face shield and an N95-rated face mask with a valve, they were able to map out the paths of droplets and demonstrate how they performed. Results showed that the expelled droplets move around the visor with relative ease and spread out over a large area depending on light ambient disturbances.

Also Read: The Cycling Federation Of India Announces First Ever Cycling Summit In India

“Visualisations for the face mask equipped with an exhalation port indicate that a large number of droplets pass through the exhale valve unfiltered, which significantly reduces its effectiveness as a means of source control,” the findings showed.

The key takeaway illustrates that face shields and masks with exhale valves may not be as effective as regular face masks in restricting the spread of aerosolised droplets.

“Widespread public adoption of the alternatives, in lieu of regular masks, could potentially have an adverse effect on ongoing mitigation efforts against Covid-19,” the researchers warned. (IANS)

STAY CONNECTED

19,120FansLike
362FollowersFollow
1,781FollowersFollow

Most Popular

Online Exhibition Of Photographs To Commemorate International Day Of Person With Disabilities

An online exhibition of photographs by Gurugram-based writer, filmmaker, and self-taught photographer Vijay S. Jodha, titled 'Born to Perform' featuring portraits of some of...

Bollywood Actors Who Could Not Continue The Limelight

Failure, competition, and the pressure of staying relevant perennially loom on actors in Bollywood. Some can cope with it and some cannot. Those who...

Power Demand Can Be Enhanced Through Energy-Efficient Appliances

Power demand can be enhanced through energy-efficient appliances, according to a report by Smart Power India (SPI), a subsidiary of The Rockefeller Foundation. The survey...

Birth Control Pills May Decrease Risk of Severe Asthma

Taking birth control pills may cut the risk of severe bouts of asthma in women of reproductive age with a respiratory condition, say, researchers. The...

Lockdown Does Not Curb Rise in Greenhouse Gas Emissions: UN Report

The World Meteorological Organization reports greenhouse gas emissions in the atmosphere continue to reach record levels despite COVID-19 lockdowns. The WMO has just released its annual Greenhouse Gas...

Millennials Spend Most of The Time on Smartphones

Would you give up nearly a decade of your life looking at your cellphone? Calculated by today’s usage, the average person spends a little over...

Innovation Important For Business Performance in India

Amid the pandemic, 77 percent of Indian organizations have found innovation to be critical or important to their performance and resilience, said a Microsoft...

Climate Change Increases Risks of Diseases in Animals

Changes in climate can increase infectious disease risk in animals, with the possibility that these diseases could spread to humans, warn researchers. The study, published...

Recent Comments