A series of recent studies such as direct aerosol virus detection and aerodynamic analysis have shown that aerosols play a very critical role in the spread of respiratory viruses. The main manifestations are: 1. Aerosols are highly concealed and can be transmitted when talking, s

2024/06/2520:08:33 science 1597

http://science.sciencemag.org/content/373/6558/eabd9149

Respiratory viruses have long been considered to be spread mainly through droplets and contaminated surfaces of daily necessities. However, recently, the new coronavirus has frequently occurred super-spreading events and is mainly spread through ventilation. The phenomenon of bad indoor transmission has made people re-recognize the influence of " aerosol " transmission.

Researchers such as Chia Wang of National Sun Yat-sen University in Taiwan and UCSD Kimberly Prather summarized a series of studies on the process of respiratory viruses from virus shedding and transmission to new infections. They believe that the reason why everyone believes that respiratory viruses mainly rely on droplets and pollutants to spread is Because it has been difficult to detect aerosols for a long time, aerosols have been mistakenly passed on to other ways to spread . A series of recent studies such as direct aerosol virus detection and aerodynamic analysis have shown that aerosols play a very critical role in the spread of respiratory viruses. The main manifestations are: 1. Aerosols are highly concealed and can be transmitted when talking, singing or even breathing. Generate aerosols; 2. The aerosol propagation distance is far, which can be much longer than the one meter spread by droplets; 3. The aerosol suspension time is long, up to several hours; 4. The aerosol can directly reach the bronchus and even alveoli, which is very important for new The detection of infected people brings difficulties and may even potentially affect the course of the disease. (Note: This article considers that droplets with a diameter of less than 100 microns are aerosols, because they can float in the air for more than 5 seconds and spread more than 1 meter)

Based on this, researchers call for more attention to aerosol transmission indoors. Pay attention to ventilation, air flow, air filtration and ultraviolet disinfection (Note: care needs to be taken to avoid direct exposure to eyes and skin). Not only will this help end the current pandemic, it will also be good for long-term health.

This work was published in Science(1) on August 27, 2021.

Comments:

is a very comprehensive and thorough review, especially the analysis of traditional misunderstandings. This also shows that when we analyze a problem, we not only need to see whether there is scientific basis, but also need to know more about where the data comes from? Is it reliable? What are the potential pitfalls and limitations? What are the technical challenges? Are there even some problems that have reasonable logic but no direct data due to technical difficulties? How to analyze risk-benefit to make certain decisions in the face of uncertain evidence?

Corresponding author profile:

http://aerosol-ccw.nsysu.edu.tw/en/team_info/15/1/10

https://kprather.scripps profiles.ucsd.edu/biography/

Reference:

1. C. C. Wang et al. al., Airborne transmission of respiratory viruses. Science (80-. ). 373,eabd9149 (2021).

Original link:

http://science.sciencemag.org/content/373/6558/eabd9149

Note: : Originally published in August 27, 2021 Public account "CNS Introduction"

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