The coronavirus is known to spread mainly through the air, especially indoors. Although this virus is not as contagious as, for example, measles, scientists already recognize the fact that COVID-19 able to infect most people who arein one room. This is aggravated by the lack of good ventilation and the duration of contact: tiny infectious particles that the patient exhales can hang in the air for hours in a closed room and penetrate into the bodies of other people. We offer to visually see how the infection occurs, and whether wearing masks can affect the spread of the virus.
- 1 How the coronavirus spreads
- 2 How can you get infected with the coronavirus?
- 3 Could the scream accelerate the spread of the coronavirus?
- 4 Is it possible to get coronavirus in a cafe?
- 5 Spread of coronavirus in school
How the coronavirus spreads
Let's take the most common situation: a person comes to visit friends or family, not knowing (we hope) that he is infected with the coronavirus.
After four hours of communication with this person, no matter at what distance they are from him, all the remaining 5 people are already will be infected... If we talk about a room of 20 square meters without good ventilation.
If masks are used by all people inthe room will be infected not 5 people, but 4 people. Why is that? The fact is that masks themselves do not prevent infection if contact is very long. In our case, people in the room talk for 4 hours - most masks cease to be effective after 2 hours.
And this is how the picture of infection will look like if everyone in the room uses masks, reduce contact from 4 to 2 o'clock and provide air flow into the room and its exit.
How can you get infected with coronavirus?
Currently, health authorities recognize three main ways of contracting COVID-19.
Scientists from Japan recently found that coronavirus survives on the skin for up to 9 hours. Who would have thought!
In the latter case, a distance of 1.5 meters or more is considered safe, but if you are with the patient in the same room for a long time, then she won't help.
Only 60 minutes an infected person can "populate" a room with virus particles, and if there is no ventilation in the room, they remain in the air and eventually infect other people.
Could screaming accelerate the spread of coronavirus?
According to scientists, the nature of the conversation really affects how quickly the virus particles spread in the room.
So, if the patient is silent, then even afterhours of contact with him, the other person can be safe (if, of course, wears a mask). In a normal conversation, the threat of infection will come within 15 minutes, and with a cry - completely in 2 minutes.
Recent scientific publications have forced the Worldthe health organization recognizes the risk of such contamination. They note that under certain conditions, people with COVID-19 can infect others, even if they are more than two meters away. This happens in closed rooms with insufficient ventilation.
Can you get coronavirus in a cafe?
Outbreaks of coronavirus at events inpublic places and establishments such as bars and restaurants form an important part of the spread of the infection. First of all, they are the most destructive: each outbreak of the virus in a small nightclub ends up infecting an average of 27 people.
In one of the American nightclubs in just one night with coronavirus 173 people became infected.
Suppose an infected person arrives at a nightclub at 19:00. He's without a mask, like everyone else.
By 11 p.m., everyone else will be infected with the coronavirus, with the exception of those who were relaxing on the open veranda.
If everyone, including the infected, would wearmasks, the risk of infection would be significantly reduced. But due to the long stay in the same room and the lack of ventilation, many would still go home with the coronavirus.
And this is how the picture of the spread of the virus will look like if everyone will wear masks, the room will be good ventilation and duration of communication will halve... Only one potentially infected person is the one who communicated most closely with the patient.
Spread of coronavirus at school
The same goes for any other public place, including schools and universities. A sick teacher without a mask will infect most of the children in the class in just 2 hours.
A sick teacher with a mask will infect fewer students if they are also wearing a mask.
The risk of infection will be minimized if the lesson is cut in half and the classroom is well ventilated.
To calculate the likelihood of human infectionused a simulator developed by a group of scientists led by Professor Jose Luis Jimenez (University of Colorado) to show the importance of factors that influence the spread of coronavirus. The calculation is not exhaustive and cannot include countless variables that contribute to infection, but it shows the development of risks based on factors that are entirely in our control. So keep wearing the mask, but do not forget that the duration of contact with people should be minimized even in this case. Better yet, try not to meet with anyone once again - you can also talk about science in our Telegram chat.