论COVID-19冠状病毒的空气传播特性
On the airborne aspect of COVID-19 coronovirus
AI总结：
该研究提出COVID-19可通过携带感染性飞沫的 puff 云空气传播，计算显示小粒径飞沫悬浮时间长，现有社交距离建议在部分场景下不足。
摘要：
目前被广泛接受的观点是，COVID-19要么通过表面污染传播，要么通过未感染者与感染者的密切接触传播。表面污染通常发生在COVID患者呼气、打喷嚏或咳嗽时产生的受感染飞沫沉降在附近物体表面时。为遏制疫情，世界卫生组织（WHO）倡导保持社交距离和做好手部卫生的建议。我们认为，COVID-19冠状病毒还可通过COVID患者产生的携带受感染飞沫的 puff 云实现空气传播。一项基础计算显示，直径5μm的呼吸道受感染飞沫可悬浮约9.0分钟，而直径2μm的飞沫可悬浮约1小时！正如文中所讨论的，WHO建议的3英尺社交距离以及美国疾病控制与预防中心（CDC）建议的6英尺社交距离在某些情况下可能并不足够。
英文摘要：
It is a widely accepted view that COVID 19 is either transmitted via surface contamination or via close contact of an un-infected person with an infected person. Surface contamination usually happens when infected water droplets from exhalation/sneeze/cough of COVID sick person settle on nearby surfaces. To curb this, social distancing and good hand hygiene advise is advocated by World health Organization (WHO). We argue that COVID 19 coronovirus can also be airborne in a puff cloud loaded with infected droplets generated by COVID sick person. An elementary calculation shows that a $5~μm$ respiratory infected droplet can remain suspended for about 9.0 minutes and a $2~μm$ droplet can remain suspended for about an hour! And social distancing advise of 3 feet by WHO and 6 feet by CDC (Centers for Disease Control and Prevention) may not be sufficient in some circumstances as discussed in the text.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
