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Written by: Li Enci
2020-02-09 07:46
Last updated: 2020-02-09 07:46Shanghai authorities held a press conference yesterday (8th). Health and epidemic prevention experts said that Wuhan pneumonia can be transmitted through "aerosol" (aerosol) in addition to droplets and contact, that is, airborne. Aerosol transmission means that the droplets are mixed in the air to form an aerosol, which is suspended in the air, which can cause infection after being inhaled by humans.
CUHK Professor of Respiratory Sciences Xu Shuchang said that aerosol transmission occurs only when medical personnel perform mist generation procedures, such as sputum suction, tracheal intubation, bronchoscopy, use of a ventilator, etc. Generally, eating hot pot, "Sauna Or using steam from an iron does not increase the risk of airborne viruses. Kong Fanyi, director of the Department of Infectious Diseases of the Department of Internal Medicine of the University of Hong Kong, said that atomized droplets can float up to 10 meters in the air and are relatively infectious.
▼ Wuhan pneumonia epidemic spreads more than 30,000 people across the country confirmed ▼
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Aerosols are produced by suctioning, tracheal intubation, etc.
Aerosol transmission means that the droplets are mixed in the air to form an aerosol, which will be infected by others. Because droplets usually contain solutes (such as sodium chloride), the droplets will quickly dry and shrink to form a "droplet core". Pathogens attach to droplet nuclei and remain suspended in the air for a long time, and may reach the lower respiratory tract of the body. As far as contact transmission is concerned, droplets are deposited on the surface of the article. After other people contact and contaminate their hands, they then contact the mucous membranes of the oral cavity, nasal cavity, eyes, etc., causing the virus to enter the body.
CUHK Professor of Respiratory Sciences Xu Shuchang said that air transmission in the hospital environment will only occur when medical personnel perform mist generation procedures, such as sputum suction, tracheal intubation, bronchoscopy, and use of a ventilator. He emphasized that only the above-mentioned medical procedures will generate droplet nuclei, which will cause aerosol transmission; and eating hot pot, sauna or using iron will not increase the risk of airborne transmission.
Xu Shuchang, Chair Professor of CUHK Respiratory Department. (Profile picture / Photo by Lu Yiming)
Special case of aerosol transmission in SARS Amoy Gardens
Kong Fanyi, director of the Department of Infectious Diseases at the Department of Internal Medicine of the University of Hong Kong, said that ordinary droplets can float 3 meters in the air. He explained that when a patient uses medical equipment such as a ventilator or a sputum suction device, the droplets will be atomized, the pressure will become greater, and they can float up to 10 meters in the air, which is also highly infectious. He pointed out that in 2003, a large number of households in the Shaoxing Garden were infected. The U-shaped drains dried up and caused gas barrier failure. After the water containing virus was atomized, aerosol transmission occurred through the exhaust fan, which was a very special case.
Kong Fanyi, Director of the Department of Infectious Diseases, Department of Internal Medicine, The University of Hong Kong. (Photo / Photo by Wu Zhongkun)
The doctor's organization "Xinglin Awakening" also specifically on the FB page to explain whether Wuhan pneumonia can be transmitted through the air, as shown in the figure below.
The Shanghai Epidemic Prevention Department recommends that, in order to avoid air and contact transmission, in addition to avoiding contact with secretions of suspected infected persons and not sharing personal daily necessities, it is also recommended to use chopsticks, eat fast, talk less, and avoid shaking hands and hugging.
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Wuhan Pneumonia Xu Shuchang