Will 20 19 coronavirus disease spread through the air? Has WHO revised the relevant protection guidelines based on recent academic research on aerosol transmission? The answer is no.
Today, WHO officials said that according to the current evidence, 20 19 coronavirus disease is mainly transmitted from person to person through respiratory droplets. Droplet transmission occurs when a person is in close contact with someone who has symptoms of respiratory infection and thus has the opportunity to contact potentially infectious droplets. Droplet transmission may also occur through contact with the surface of objects in the environment around the infected person.
Therefore, if you inhale the virus within 20 19 years of coronavirus patients 1 m, or touch the contaminated surface before washing your hands, and then touch your eyes, nose or mouth, you may be infected.
Air transmission is different from droplet transmission. These particles come from the evaporation of larger water droplets or exist on dust particles. They may stay in the air for a long time, and they can travel more than 1 meter.
In view of 20 19 coronavirus disease, the virus may spread through the air in some environments and during medical operations that can produce aerosols. Analysis of 75465 cases of coronavirus disease in China, 20 19, no airborne case report.
So far, several academic papers have discussed whether novel coronavirus can be detected in the air, in order to provide preliminary evidence that the virus may spread through the air. These preliminary findings need careful interpretation.
The New England Journal of Medicine recently published an article about how long novel coronavirus can exist in the environment. Under laboratory conditions, the research team used a three-jet Collison atomizer and a Goldberg drum to artificially generate virus aerosol, and observed that the aerosol could be suspended in the air for a period of time, about 3 hours.
It should be noted that Goldberg drum is a kind of high-energy equipment, which does not conform to the general situation of human cough. Moreover, even if it is found that novel coronavirus can exist in the form of aerosol particles for 3 hours under this condition, its conditions are not consistent with the clinical operating environment in which aerosols are produced, in other words, the aerosols studied are produced by laboratory operation.
Based on the existing evidence, WHO reserves the original recommendation, that is, the medical staff of patients with 20 19 coronavirus disease are advised to take anti-droplet and contact isolation measures, and it is recommended to take anti-contact and air-borne isolation measures when performing medical operations that produce aerosols.
Who's advice to the public remains unchanged, namely:
Keep a distance of at least 1 m from others;
Disinfect the frequently contacted surfaces;
Wash your hands frequently and thoroughly;
Avoid touching your eyes, nose and mouth with your hands.
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