The mask alone cannot stop the spread of COVID 19 without physical distance.

According to one study, wearing a face mask alone does not prevent you from catching the new coronavirus that causes COVID-19 if you do not maintain physical distance. In this study, published in the journal Physics of Fluids, we tested how five mask materials affect the spread of droplets carrying the SARS-CoV-2 virus when coughing or sneezing.

All materials tested by researchers have dramatically reduced the number of droplets transmitted.

However, they said that even when the physical distance was less than 6 feet, enough droplets that could cause viral disease passed through some material.

“Masks definitely help, but they can spread or infect the virus even when people are very close to each other,” said Krishna Kota, an associate professor at New Mexico State University in the United States. ..

“It’s not just the mask that helps, it’s both the mask and the distance,” Kota added.

Researchers have developed a machine that uses an air generator to mimic human coughing and sneezing.

The generator was used to blow small liquid particles, such as sneezing and coughing air droplets, through a laser sheet in an airtight square tube with a camera.

They block the flow of droplets in the tube with five materials: regular cloth, two-layer cloth mask, moist two-layer cloth, surgical mask, and medical-grade N-95 ventilator. did.

Each mask captured most of the droplets, from regular cloth masks that let about 3.6% of the droplets pass through to N-95 masks that statistically stop 100% of the droplets.

Researchers point out that even a small percentage of droplets can get sick at distances less than 6 feet, especially if a person with COVID-19 sneezes or coughs multiple times. did.

According to researchers, a single sneeze can carry up to 200 million small viral particles, depending on the severity of the carrier’s illness.

They said that even if the mask blocked most of those particles, if the person was near the carrier, they could escape enough to get sick.

“Without a face mask, it’s almost certain that many foreign objects will move to susceptible people,” Kota said.

“Wearing a mask provides substantial but incomplete protection to sensitive individuals by reducing the number of outpatient sneezes and cough droplets that enter a person without a mask,” he said. ..

Kota added that people should strive to minimize or avoid close human interactions, either face-to-face or head-on.

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