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On day 1, at a fast food restaurant in central Seoul, citizens sit face to face and eat. Unlike coffee shops that can only be sold by packaging, this is expected to be controversial about fairness. [뉴스1]
There was a case of a new coronavirus infection (Corona 19) after being together for 5 minutes indoors more than 20 feet apart. The cause was that the saliva (splash) caused an infection from the air conditioner wind. It is pointed out that it is not enough to keep a distance of 2 meters in an indoor air conditioner or hot air blower.
Spread through the air conditioning to eat in the restaurant
No windows or ventilation systems except entrance doors
He noted that “an interior distance of 2 m is not enough”
According to the research team of Professor Lee Ju-hyung from the Department of Preventive Medicine at Chonbuk National University School of Medicine, on day 1, patient A confirmed in Jeonju, Jeonbuk, Jeonbuk last June, and patient B , who was 6.5 m from a restaurant, were infected for about 5 minutes. Mr. A showed the first symptoms on June 16 and tested positive on the 17th. However, no clear source of infection could be found at that time.
Corona 19 infection route related to Jeonju restaurant on June 12
Considering the incubation period, the research team estimated that Mr. A would have been exposed to the virus from 2 to 15 of the same month, and then followed the movement. Mr. A has never traveled abroad or to the country except Jeonju. At the time, Jeonju had almost no community infections in the previous two weeks, so no confirmed cases came out.
The only time the confirmed person and the traffic line overlapped was at the time when he stayed in the same restaurant for 5 minutes with patient B from Daejeon who visited Jeonju. However, Mr. A and Mr. B were about 6.5 m apart and there was no direct or indirect contact. Professor Lee Ju-hyung said, “When Mr. B entered the restaurant, Mr. A’s meal had finished, so the waitress did not go to Mr. A’s table, did not touch the handles, and did not he used the bathroom, so there was no contact with Mr. B. ” said.
In the end, the research team measured airflow, seeing a low probability of transmission by direct contact or utility. At the time, the dining room had two ceiling air conditioners that operated without windows and ventilation systems other than the entrance doors. The air flow between Mr. A and Mr. B was 1 meter per second.
Professor Lee explained: “When the wind does not blow, the drop sinks within 1 ~ 2m, but if the wind blows, long-distance propagation is possible,” said Professor Lee. “The wind from the fan can fly up to 5 m in 1 second.” In fact, Mr. C, who stayed in the restaurant about 4.8 m from Mr. B, for 20 minutes, was also infected.
Professor Lee said, “Mr. A and Mr. C were facing confirmed patient B” and said, “The person who was on his back with Mr. B was not infected.” He said: “If you keep a distance of 2 meters or more from restaurants or install partitions to control the flow of the wind, you can help prevent radio waves.”
Even when several confirmed cases were known at Starbucks in Paju in August, it was argued that air conditioning could be one of the causes of the spread. The results of this study were published in the latest issue of the Korean Journal of Medicine (JKMS).
Reporter Hwang Soo-yeon [email protected]
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