Catching corona virus outside is rare but not impossible

Catching corona virus outside is rare but not impossible

WASHINGTON (Reuters) – Almost all documented coronavirus infections have been transmitted indoors, but experts say wearing a mask is permissible because there is still a risk of infection.
In such cases, when people stand close to each other and talk for long periods of time at parties or election rallies, the chances of catching the virus increase.
Since the onset of the epidemic, studies have reported cases of infection in restaurants, homes, factories, offices, conferences, trains and planes.
A study published in April identified a case of overseas transmission between two Chinese villagers in more than 7,000 studies.
In an analysis of 25,000 cases, which have not yet been independently reviewed, six percent of the cases were related to external factors, such as sporting events or concerts.
These were in adjoining areas where social distance was not observed, or where people stayed for a while, wandering around and talking or singing loudly.
“In practice, there were no incidents we could identify in everyday life outside,” Mike Wade, a professor and researcher at Canterbury Christchurch University, told AFP.
According to a group of scientists and engineers, including professors from American, British and German universities, the data show that “outdoors is much safer than homes and the same activity.” And for distance.
The group explained that by comparing “aerosols” carried by viruses with cigarette smoke, viruses released into the air are rapidly reduced in the atmosphere.
Since February, numerous studies and health officials have pointed to the path of air transmission through the hidden clouds of microscopic droplets (aerosols) that we release through breathing, talking and singing.
This is in addition to the relatively larger droplets that we expel by coughing or sneezing, which can land directly on someone else’s face in a circle of one or two meters (up to six feet).
Depending on the aviation of an area, small droplets float in the air for minutes or hours. In a poorly ventilated room, but also outside, between two buildings that do not have air circulation, droplets can accumulate and be breathed by a passerby.
Steve Elgins, a geneticist and virus specialist at Harvard University, told AFP that the dose of viral particles that caused the infection was not known, but that large doses, “more likely to cause infection.”
The time spent near an infected person will be an important factor: one second on the sidewalk does not seem to be enough to catch a coyote-19. This can take at least several minutes.
“While this is not impossible, there is no evidence that Covid 19 has moved on when people outdo each other.”
Lance Marr, an expert in airborne virus transmission Virginia Tech told AFP she suggested wearing a mask outside if the place was crowded and said, “You’ll be passing by a lot of people, saying more than one minute per minute, but according to the guidelines.” Not absolute rule. ”
“When we go out with people, we may catch snakes that are out of their breath,” he said. “Any short, passing exhibition is less risky, but such exhibitions may increase over time.”
“My advice is to follow the precautionary principle and the fact that wearing a mask does no harm,” Mar added.
At the restaurant’s patio, a group of scientists suggest keeping a safe distance between tables and wearing masks while eating.
There are many variables to calculate the exact hazard in a sidewalk or park – it depends on the wind and the number of people and even the sun.
Ultraviolet rays inactivate viruses, but the speed at which they do so depends on the intensity of the sun (a few minutes to an hour).
Knowledge is limited because scientists have difficulty measuring the virus’s concentration from the outside, and conducting experiments as they do in laboratory settings.
In the case of public health, experts believe that simple and clear guidelines are ultimately more effective.
“Having a global agreement on permanent use of masks is the safest strategy,” said Crystal Polt, a professor of epidemiology and environmental engineering at Yale University.
“Needless to say, on the sidewalk, a passerby can sneeze immediately,” he told AFP.

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