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引用來源：JKMS 期刊
https://jkms.org/DOIx.php?id=10.3346/jkms.2020.35.e415
原文標題：
Evidence of Long-Distance Droplet Transmission of SARS-CoV-2 by Direct Air
Flow in a Restaurant in Korea
韓國某餐廳內 COVID-19 飛沫透過直接氣流長距離傳播證據
結論：
Droplet transmission can occur at a distance greater than 2 m if there is
direct air flow from an infected person. Therefore, updated guidelines
involving prevention, contact tracing, and quarantine for COVID-19 are
required for control of this highly contagious disease.
室內如果有來自感染者的直接氣流 有可能使飛沫傳播距離大於2公尺
paper 內也建議更新防疫準則
帶原B 傳染給 個案A C
距離與暴露(exposure)時間
室內距離分別為 6.5 / 4.8 公尺
https://i.imgur.com/42WxTDv.jpeg
個案出現症狀與確診日期
https://i.imgur.com/1PXKkgV.png
個案在餐廳當日接觸史
https://i.imgur.com/iNCgvgb.png
當日餐廳佈局與空調氣流方向
https://i.imgur.com/h981Hvj.png
研究透過室內監視器 人物訪談 以及手機地點資訊
考慮現場的空調氣流方向速度 個案之間的距離
還有訪客的移動
此次共有 3個案 （排除個案D
主要是 個案A 距離6.5公尺 且與 帶原個案B 無直接接觸
只在有空調的室內暴露5分鐘
The 39 environment samples for SARS-CoV-2 were all negative by rRT-PCR. The
results of genome sequencing of the three patients were presented as all
three cases' genomic types were GH type and identical for each other
39個現場物品採樣皆為陰性 3個案的病毒基因皆為 GH型
There are some limitations to this study. First, we did not assess air flow
using computational fluid dynamics. In addition, the air flow measurement
can't reflect all the same situations because opening of doors and motions of
cases and visitors were not reproduced. However, air flow direction and
velocity were identified between the infector and infectees using an
anemometer in the most similar environment as possible. Second, environmental
samples were collected at 11 days after the inspector visit. Though all these
results were negative, this was not proof against airborne transmission.
此項研究仍有幾個缺陷...