<Anchor>
Today (21st), the number of newly confirmed coronaviruses is expected to be around 700. In particular, there have been more than 1,000 confirmed cases in indoor sports facilities alone this year, and many cases of infection have been confirmed even if the distance is kept 2m.
This is Jang Se-man.
<Reporter>
A gym in Jeonju, Jeollabuk-do, after one instructor here was confirmed in February, so far, 80 people, including gym members, have been serially infected.
It was investigated that ventilation facilities were insufficient, and indoor masks were insufficient.
The quarantine authorities simulated how the infection progressed in this gym case.
At the far left of the screen, the aerosol from the instructor's breath begins to spread around after about two seconds.
Depending on the particle size, it may rise to the ceiling or fall directly to the floor, where medium-sized particles spread out.
It took less than 2 minutes for the aerosol from the instructor to spread throughout the indoor space.
[Bakyoungjun / Central Defense Headquarters epidemiological investigation team leader: ventilation (confirmed) are infected from inadequate room that the virus has spread to a wide area in a short time when you cough]
actual epidemiological investigation, then people around the Even if the distance was more than 2 meters, many infections occurred.
The key is the indoor ventilation rate.
Simulation results show that even in the same space, if the ventilation rate is increased, the probability of infection can be significantly reduced.
The quarantine authorities requested that the owners of indoor sports facilities be periodically ventilated at least once every two hours, and users were asked to refrain from eating and to stop using any suspicious symptoms.