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The online app calculates the risk of catching Covid-19 in different scenarios


Outdoor spaces are safer than indoor spaces to get infected with coronavirus, and more people are at higher risk than smaller groups. Public health officials often remind us of the pandemic. However, there is a new online tool to help you determine how likely you are to contract coronavirus if someone is infected in your home, office, or school.

Researchers at the Massachusetts Institutes of Technology modified their complex mathematical equation to determine the risk of contracting the coronavirus if a person is infected with Covid-19 in a room.

Anyone can use it to find out how long it is safe to stay in a room of virtually any size or type, with one to 100 people, if one of them has the virus.

For example, the tool allows users to change the size of the room. What ventilation is there, if any? Which masks are worn? How strictly do people wear their masks? and how loud and sociable the people are.

This allows users to mimic the risk of mingling during the festive season in their dining room, lounge or kitchen as well.

The tool shows that the size or type of room doesn't matter too much – but what types of masks the people who occupy it wear and the ventilation system it is equipped with can dramatically increase or decrease the risks.

Here you can try out the interactive tool for yourself.

The MIT tool's settings for homes, schools, and restaurants suggest that some people in a home with more space or hours in a restaurant are likely to be safe for days. However, as soon as the rooms are more densely occupied, the risk increases

An interactive tool allows people to calculate the risk of getting Covid19 if someone in the room tests positive. Ventilation and masks turned out to be keys. If a meal cannot be eaten outdoors, as in the winter months around Christmas, opening a window can reduce the risk as cna wears high quality surgical masks and no cotton covers (warehouse)

An interactive tool allows people to calculate the risk of getting Covid19 if someone in the room tests positive. Ventilation and masks turned out to be keys. If a meal cannot be eaten outdoors, as in the winter months around Christmas, opening a window can reduce the risk as cna wears high quality surgical masks and no cotton covers (warehouse)

In a standard room with 8 foot ceilings and a wall about 15 feet long, 10 young people, all diligently wearing surgical face masks, could safely sit and talk normally for two hours if the windows were closed due to the cold outside temperatures.

But for a family of ten, some of whom are older, in a normal dining room for Christmas dinner where no one wears a mask because they're eating and the windows are closed because it's cold outside – and there are some heated discussions with me Elevated Voices – The tool indicates that the security limit has been lowered to just three minutes.

The developers say the online site allows people to calculate risk in a more nuanced way than the simple and often vague guide to creating "bubbles" or social distance.

Calculations informing the site were published by the authors John Bush and Martin Bazant on the pe print server medRxiv.

In a standard room with 8 foot ceilings and a wall about 15 feet long, ten fit young people, all diligently wearing surgical face masks, could safely sit and talk normally for two hours if the windows were closed because of the cold outside temperature. based on calculations by MIT researchers (camp)

In a standard room with 8 foot ceilings and a wall about 15 feet long, ten fit young people, all diligently wearing surgical face masks, could safely sit and talk normally for two hours if the windows were closed because of the cold outside temperature. based on calculations by MIT researchers (camp)

MIT scientists used fluid dynamics – or how infectious droplets might float in a room – to calculate the risks of those exposures over time. However, the tool is currently only equipped for the calculation based on one infected person in a room, not on several.

How coronavirus infects the brain

According to a study, the coronavirus can reach the human brain after being inhaled through a person's nose and lodged in the nasal mucus.

It is the first known evidence that the coronavirus can infect the neurons of the brain via the mucosal pathway.

In the course of the pandemic, it became clear that the SARS-CoV-2 coronavirus not only causes shortness of breath, but also neurological problems.

For example, every third person reports symptoms such as loss of smell or taste, headache, tiredness, dizziness and nausea.

Scientists in Germany performed autopsies on 33 patients who died of Covid-19 and examined the mucus in the bridge of the nose – above the mouth where the throat joins the nasal cavity – as well as samples of brain tissue.

Coronavirus genetic material was found in the largest amounts in the mucus of the nasal cavity, but SARS-CoV-2 spike proteins that protrude from the virus and bind to human receptors to infect the cells have also been found in the brain.

Dr. Frank Heppner, co-author of the study by the Charité-Universitätsmedizin Berlin, says: "As soon as the virus is in the olfactory mucosa, it seems to use neuroanatomical connections such as the olfactory nerve to reach the brain."

This makes it useful for small gatherings, but in larger locations that may have dozens of people, such as a supermarket, the application becomes unusable.

However, people can visualize the effects of their household's Covid logs. For example, in a 400 square foot living room, if five young people wear an N95 ventilator, they can dance and sing safely for 35 minutes.

However, if you only drop the mask under your chin 50 percent of the time, that number drops to four minutes.

While parameters of space and mitigating aspects are important, the researchers say, human behavior is the most critical influencing factor. In particular, wearing high quality face masks.

In their study, the researchers applied their work to two case studies, both of which thoroughly examined their roles in the spread of the disease: classrooms and nursing homes.

For a typical US classroom with 19 students and one teacher, the researchers found that without a mask, “the expected time for first transmission after an infected person enters the classroom is 2.3 hours for natural ventilation and 18 hours for mechanical ventilation is ".

"With improved ventilation and judicious use of the mask, this period could be extended to several weeks, exceeding the recovery time for Covid-19," they add.

Longer periods of physical activity, multiple people speaking or singing at the same time would reduce the time limit by an order of magnitude, the researchers warn.

However, the good news for classrooms is not being repeated for nursing homes, and they warn that their analysis "sounds the alarm" for long-term care facilities.

They say three elderly people, each 80 square feet, are only safe for three minutes in a room with the windows open if the social distancing rule of two feet is followed.

The maximum safety limit for occupying this room if a person is infected is only 17 minutes according to the model.

"This example offers an insight into the devastating effects of the Covid-19 pandemic on the elderly," say the researchers.

"Additionally, it underscores the need to minimize indoor sharing, maintain adequate ventilation, and encourage the use of face masks."

(tagsToTranslate) Dailymail (t) sciencetech (t) Coronavirus