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How does the new coronavirus spread in a closed space such as a classroom, bar or room where several people are? This is the question of the researchers who used an experiment to see how fast COVID is spreading, an experiment published by ElPais.
According to the study, if people spend a lot of time in an unventilated room, they are at risk of becoming infected with SARS CoV2 even if they wear a mask and stay away from each other.
According to the study, there are some essential differences that save people in a closed space. If the meeting time is cut in half, the window is opened to ensure good ventilation of the room, and people wear masks, the risk of infection is significantly reduced.
Physicist Cristian Presură explained to Digi24 why this happens.
“If we reduce the exposure time by a factor of 2, if we use a mask and if we ventilate very well, the number of cases of infection decreases by a factor of 10. We have 10 times fewer infected people in that area, whether we are speaking of a bar, be it a house or a house. It is very important that all three factors contribute, “he said.
Simply talking to other people in a room increases the risk of contamination.
“When we speak, we eliminate many particles that contain the virus, 10 times more than when we are silent, and when we speak loudly, with an even louder voice, even 50 times more,” says the physicist.
“The study warns us that these particles are transported in aerosols, in the air, and we must look at them as invisible smoke. When there is smoke in the room, what do we do? Airy. It is the first thing we can do when we see smoke. We also have to look at this virus and then we have to ventilate very well. If we adopt the 3 rules: little time, mask and good ventilation, we can reduce the risk of infection by a factor of 10 ”, he explained.
The pressure also explained the connection between the length of a meal or an event held indoors and the risk of infection.
“Duration is very important, because this virus present in aerosols accumulates. And the more people around, the more we inhale. I return to the comparison with cigarette smoke. The more someone smokes, the more smoke they emit and the more we inhale. The same goes for COVID. Someone who is infected and talks: the more he talks, the more particles he removes, ”said Presură.
Editing: Monica Bonea
