Talking to a friend when infected with coronovirus can be dangerous because of the particles they have, thanks to coughing, research has suggested.
Kovid can be spread through a number of routes, including virus-containing drops when an infected person breathes, speaks or coughs – a factor experts said could help explain how Kovid is used in indoor settings Why spread more easily.
While larger droplets fall to the ground at shorter distances, smaller droplets are known as aerosols that can carry the virus more than two meters apart, and ginger.
Now experts have developed models to detect the risk posed by large droplets and aerosols and find ways to reduce it. Their results show that the ejected particles take just seconds to travel more than two meters.
“You need masks, you need distancing and you need good ventilation so that these particles do not form in an indoor space and they can be removed safely.” Co-authors of the study.
Writing in the journal Proceedings of the Royal Society A, de Oliveira and colleagues, he described how they make models that take into account factors including when to speak to infected individuals or to cough as well as the makeup of the drops. They take time to settle down.
The team also looked at the risk of infection, taking into account the viral load of individuals with Kovid, and the approximate dose needed to cause an infection – the latter was based on studies of a different coronovirus.
The team concluded that it was unsafe to stand without a mask at a distance of two meters from an infected person talking or coughing, both situations being at risk of infection.
The team adds that one hour after an infected person has spoken for 30 seconds, the total aerosol has more viral mass than after a cough – which add up in small spots and without ventilation it causes kovid May be sufficient for.
“Speaking is a very important issue to consider because it produces very fine particles. [than coughing] And these particles, or aerosols, can be suspended for an hour in sufficient quantities to cause disease.
But whether people will catch Kovid, he said, depends on how much aerosol they breathe – which is influenced by factors in which masks are worn, whether the condition is indoors, the level of ventilation, and it includes Distance between people.
The team has developed an online calculator for its work, called Airborne.cam, to find users at their risk of staying indoors infected through airborne particles alone.
According to the tool, one hour spent 250 m2 The store – believed to have a maximum capacity of 50 people and ventilation at par with offices – results in one person having an approximate 8% chance of getting infected with coronovirus, assuming the store has five infected people and no one. Not even wearing a mask.
If ventilation improves, the air is renewed five times an hour instead of three times, this risk can be reduced by 2%; A similar drop can be obtained if everyone wears a three-ply face mask.
Although infection risks are only theoretical estimates, and are not specific to the new UK Coronavirus version, the team said the tool could help users figure out ways to stay safe in various scenarios.
“The idea is not to obtain absolute risk data from the instrument, but to use it to see how mitigation strategies affect the risk of infection. It can be used to rank these strategies, for example, “de Oliveira said.
Prof. Catherine’s tip, A member of the Scientific Advisory Group for Emergencies and an expert on airborne infections at the University of Leeds welcomed the study, but cautioned that the results were based on several assumptions.
“It is likely that the results represent a realistic worst-case scenario because the model uses a significantly higher viral load as one of the assumptions, and this is a significant effect on the risk that is predicted,” she said. , Linking viral load varies between people and through disease.