These are the most effective non-medical masks to avoid the propagation of COVID-19, according to a study

More than six months ago that the population of the United States lives with an invisible enemy: the coronavirus.Since then, facial masks have become a usual garment between older and young.There are all kinds, of cloth, plastic, with valves, without them, also a handkerchief can do the functions of a cover, but are they all equally effective to avoid the transmission of COVID-1?: A study concludes thatnot.

If you use the home cover, those of two layers of padded fabric well adjusted to the face, they are safer than those of a layer or the handkerchiefs, according to the results that a simulation of the Florida Atlantic University in which the researchers experienced withNon -medical masks of different materials.

For the study, which was published on Tuesday in the Physics of Fluids magazine, the researchers compared a non -medical commercial mask, a handkerchief or t -shirt to cover the mouth, and a manufactured at home well adjusted to the face, whichThey are available for the general public and whose efficacy had not been tested so far.

"While there are some previous studies on the effectiveness of medical quality equipment, we do not have much information about fabric coatings that are more accessible to us at this time," said Siddhartha Verma, assistant professor at the Oceanic Engineering Departmentand mechanics of the Florida Atlantic University and author of the study.

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To check the effective.5 feet away from an adult man.Then they caused a sneeze and coughing helping a smoke generator and a manual pump.

A laser was in charge of detecting the drops with fluids that the mannequin expelled and the distance that the secretions ran depending on the material of the cover and these were the results were tracked: these were the results:

-Without facial protection the particles reached 2.4 feet away.

-With a folded cotton handkerchief, the drops traveled to 1.2 feet.

-With the commercial mask, little more foot.

-With a dual fabric cover and sewn well adjusted they did not exceed 0.1 feet.

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Given the conclusions, the handkerchief or a shirt tied to the head were the least effective cover.

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"It is important to note that both the number and the concentration of the drops will decrease with the increase in distance, which is the fundamental reason behind social distancing," said Manhar Dhanak, professor at the Department of Oceanic and Mechanical Engineering at Florida Atlantic UniversityUniversity and study co -author.

The signature of the research stressed that the experiment would help health professionals and manufacturers to have greater precision about the efficiency of facial masks especially in places where social distancing cannot be maintained.

In that regard, the Centers for the Control of United States diseases (CDC, in English) recommend fabric masks in public to avoid the propagation of COVID-19.A few layers of cotton prevent most of the potentially infectious respiratory droplets to escape the air around them, and in the same way they do not give so much heat as the adjusted N95 type.

In that sense, the World Health Organization has also pronounced, which urged governments to encourage the population to use fabric facial masks that are not medical, especially in those confinement, public transport or social event environmentswhere social distancing is not possible.

In the same way he advises to wash the cappes daily with hot water and soap, save it in a clean bag, in addition to making sure to clean his hands before touching it and that he always covers both the mouth and the nose, once adjusted.

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With information from Physics of Fluids, CDC and WHO

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