A new study from the Massachusetts Institute of Technology shows that social evacuations indoors at a height of 60 feet are no safer than at a height of 6 feet. In fact, the “exposure time” indoors is more important.
In a report that questioned the COVID-19 prevention guidelines, researchers said that the “six-foot rule” of health officials was “no benefit”, especially when wearing a mask.
Martin Bazant, professor of engineering at the Massachusetts Institute of Technology, wrote: “Alienation doesn’t help you much, it also gives you a false sense of security because of the safety at 6 feet indoors. It’s as safe as at 60 feet.”
“In fact, everyone in this field faces roughly the same risks.”
In this study, published this week in the Proceedings of the National Academy of Sciences, researchers calculated the risk of exposure to the virus based on factors such as residence time in the body, air filtration and circulation. .
They also studied factors such as the use of masks, immunizations, and respiratory activities (such as breathing, eating, and talking).
They found that the time spent indoors with an infected person is more important than your distance from them-according to researchers, the Centers for Disease Control and Prevention and the World Health Organization have ignored this factor.
“It really has no physical basis, because the air that the person wearing the mask breathes rises and falls in other parts of the room, so you are more susceptible to ordinary background influences. [air]”, Bazant said.
He added: “Our analysis continues to show that it is not actually necessary to close many closed spaces. Normally, the spaces are large enough and well ventilated, and people spend so long together that even under full load It is also possible to safely operate these spaces, and the scientific support for the ability to reduce these spaces is indeed not very good.”
Bazant said the 6-foot social distancing rule that closed businesses and schools was “just unreasonable.”
He said: “We need to convey scientific information to the public in a way that is not only afraid of spreading, but is actually based on analysis.”
He said that the CDC’s social guidance guidelines are likely to be based on early research on large-particle respiratory drops.
“From the beginning, this emphasis on distance was actually misplaced. The CDC or the World Health Organization have never really provided a justification for this,” Bazant said.
“The only reason I know is based on research on coughing and sneezing. What they observe is the largest particle that may settle on the floor. Even so, it is still very similar. You can determine that the range is longer or shorter, larger Droplets.”
The study did not mention whether there is a safety risk difference between zero feet and six feet.
Researchers say that in general, masks work by blocking larger respiratory droplets, including preventing coughing and sneezing, but most people who spread the coronavirus do not have these symptoms.