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https://tech.sina.cn/2020-02-08/detail-iimxyqvz1312652.d.html

On February 8, the Shanghai Municipal Government held a press conference on epidemic prevention and control. At the press conference, health and epidemic prevention experts confirmed that the transmission routes of pneumonia of new coronavirus infection that can be identified are mainly direct transmission, aerosol transmission and contact transmission.

Researcher at the Institute of Geoenvironmental Sciences, Chinese Academy of Sciences, Director of the Chinese Academy of Sciences Aerosol Chemistry and Physics Key Laboratory, and Secretary-General of the International Aerosol Society Drops, breathing, coughing, sneezing and size all produce droplets. Its particle size is generally 0.1 mm or less. It evaporates quickly after exhaling the human body (within 1 second or even tens of milliseconds) to form a droplet core (particle diameter of several microns). The droplet core is suspended in the air for a long time and migrates with the air. Its transmission distance can reach hundreds of meters or even longer, increasing the risk of contactless transmission.

Earlier, on February 5, the Health and Medical Commission issued the "Diagnosis and Treatment of New Coronavirus Infected Pneumonia (Trial Fifth Edition)", regarding the transmission route in the previous "Respiratory droplet transmission and contact transmission is the main route "Based on the addition of" aerosol and digestive tract transmission channels to be determined. "