How risky it can be to stay in one stanza, more or less crowded, to be infected by Sars-Cov-2, the virus that causes the Covid-19? And how long do you have to stay there, inside, to have a greater chance of it? The researchers of theCambridge University who have developed Airborne.cam, a web application, which allows you to evaluate, starting from different values (such as the surface, the height of the ceiling, the people in a room, the activity you are conducting) which is the risk of being able to stay in contact with contagious droplets, that is the droplets that are naturally part of a person’s breath and speech and that can contain the virus inside them.
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The simulation on 100 square meters
In a room of 100 square meters with a three-meter ceiling, which is occupied for 2 hours by 20 people with only one infected and without protective masks, the estimated risk of infection is about 19% after two hours. It would be precisely the air exchange at the base of the risk reduction, which could be more or less consistent based on how many times, every hour, it is aired.
The algorithm also offers the possibility of simulating cases even in the presence of people with masks. If worn by infected people, the efficiency of the devices has been estimated at 90% in the case of Ffp2, at 59% if surgical and 51% and 35%, if, on the other hand, it is about 3-ply and 1-ply fabric masks. .
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For scholars, however, both a brief cough and a chat are “dangerous results within 2 meters without personal protective equipment.”
How to reduce the infection in cars?
According to a study that was coordinated by the University of Massachusetts and that was published in Science Advances, the passenger compartment of a car represents a place of high transmission of pathogens. Even with personal protective equipment, research has shown an accumulation of the viral load inside a passenger compartment of a car already in a journey of only 15 minutes, with a maintenance of the presence of the virus in aerosols for up to 3 hours.
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In the simulation the case of one was taken sedan, with two people traveling in the car, one in the front seat (driving) and the other on the opposite side but in the back seat. The best configuration for airing is to have all the windows open, or one in the back and two in the front. Air enters through the rear window, runs behind the rear passenger seat and exits through the front window. In the case of collective transport, such as taxis, the barriers between the front and rear seats can reduce the transmission of droplets.
Also in this study, as in the case of the simulations carried out by the University of Cambridge, the air exchange.
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