[ad_1]
Bologna, October 31, 2020 – How to spread the word Covid contagion by By air? In an interesting article in the Spanish newspaper The country, supported by a graphic animation, the risks of contagion are well explained of aerosols indoors, showing how the Coronavirus ‘flies’ in the air, but also how to minimize them even in tight spaces.
The article highlights how the interior they are the most dangerous, but also how to limit the risk of contagion to a minimum by implementing all the measures we have available to combat the contagious aerosol. The video examines three probabilities of contagion, in so many daily scenarios, where ventilation, masks and the length of the meeting can make a difference.
At home
Meeting in a living room
12 noon In the first example, six people are in a living room at home, one is infected. In fact, in Spain 31% of known epidemics occurred in this situation, a social encounter, especially with family and friends.
4 pm In this case, after 4 hours without masks or ventilation, speaking loudly, regardless of the distance between people, the other 5 present would be infected. But if everyone had used the mask, the risk of contagion would have been reduced to four new positives. Keep in mind that masks alone do not prevent infections if exposure is very long. So, to further reduce the chances of getting sick, it is necessary to apply all precautions: wear the masks, cut the duration of the meeting in half, and ventilate the room well. In the Spanish model, in this way, only the person closest to the infected person would run the risk of becoming infected.
In a bar or restaurant
The article goes on to explain that Covid does spread in the air, but especially in closed and non-ventilated spaces. Scientists know the important role that aerosol contagion plays, due to the tiny contagious particles that a patient exhales and that remain suspended in the air indoors. The Spanish health authorities recognize three forms of contagion of Covid: when infected people speak or cough, the microparticles are spread in the air and can end up in the eyes, mouth or nose. Infection from contaminated surfaces is less likely, as several studies in both the United States and Europe indicate.
In the first period of the pandemic, scientists believed that the main vehicle of contagion was the large droplets expelled by positive subjects when they coughed or sneezed, but today it is known that even shouting or singing for a long time, in a closed and poorly ventilated space , can increase. the risk of infections. When we speak, we throw 50 times more virus-laden particles into the air than when we are silent. Furthermore, the aerosol, which is concentrated in an unventilated room and increases the saturation of the environment over time, is made up of particles that can be contagious up to five meters from a person and for many minutes. To date, infections in bars and restaurants are an important part of the spread of the epidemic in the social sphere. And according to the article they are above all the most explosive. In fact, each outbreak at a nightclub represents an average of 27 infected people, compared to just 6 infections at family gatherings.
The example of a bar with reduced capacity
7:00 p.m. In a bar where the capacity has been reduced by half, there are 15 people who consume and three employees. The risk increases because the doors are closed and there is no ventilation.
11:00 pm In the worst case, the example shows that after four hours, 14 clients were infected. But if all the masks were used, only 8 people got infected. Risks that are still reduced when reaching a single infection, if the bar is ventilated and if the time spent indoors is shortened.
At school
In Spain, only 6% of the total outbreaks in the country were registered in schools and educational centers. In this case The country highlights the different dynamics of aerosol contagion between students and teachers. In fact, the latter in class speak more and raise their voices a few times, thus multiplying the expulsion of infected particles. While the student speaks less and less frequently.
In class with 24 students
9 am In the graph, the most dangerous situation occurs in a classroom without ventilation, in which the infected is the teacher.
11:00 am After two hours, if nothing intervenes, the aerosol increases the probability of contagion for at least 12 students. But if everyone had a mask, the number would drop to 5. The observed outbreaks, the newspaper explains, showed a random distribution of infections in the classroom, by aerosols, which accumulate and are distributed throughout the room without ventilation. The latter is also essential in the classroom, in fact if the room is ventilated during the lesson, both naturally and mechanically, the risk is greatly mitigated.
To calculate the probability of contagion, the Spanish newspaper used a simulator developed by a group of scientists led by Professor JLuis Jiménez dared (University of Colorado).
[1/7] There has been a lot of interest in this article on the airborne transmission of the coronavirus but have you seen the other specials we have published on the pandemic? https://t.co/J4Y0oFSHTt pic.twitter.com/xtUXFONU91
– El País English Edition (@elpaisinenglish)
October 29, 2020
© All rights reserved
[ad_2]
