What does aerosol transmission mean? How many meters is the range? What are the differences from droplet transmission?
| Droplet transmission, contact transmission, and aerosol transmission are the three common transmission routes of COVID-19. At noon on April 10, the Ningbo Center for Disease Control and Prevention issued a notice that an incident suspected to be caused by aerosol transmission occurred in this round of epidemic in Ningbo. So, what does aerosol transmission mean? How many meters is the range? What are the differences from droplet transmission? 1. What does aerosol transmission mean? Aerosol transmission refers to the pathogen nuclei left behind by droplets while suspended in the air. These droplet nuclei float to distant places in solid or liquid form to spread and infect. Simply put, aerosol transmission refers to droplets mixing in the air to form aerosols, which cause infection after inhalation. 2. How many meters is the aerosol transmission range? The propagation distance of aerosols can reach tens or even hundreds of meters, which is mainly related to the type of microorganisms and the environment. In an environment with air convection, the aerosol will float with the air, and its propagation path and distance will be expanded. If it is in a closed environment, the concentration of aerosols will increase, which will make the human body more susceptible to infection. Therefore, the transmission distance is not only related to the aerosol mode, but also to the virus load and environmental circulation. 3. What are the differences between aerosol transmission and droplet transmission? 1. Different key solutes The key solute for droplet transmission is droplets, and the key solute for aerosol transmission is droplet nucleus, that is, the nucleus composed of protein and pathogens. 2. The volume of solutes is different. The volume of droplet transmission is larger, while the volume of aerosol transmission is smaller and lighter. 3. Different transmission distances: The transmission distance of droplet transmission is generally 1-2 meters, and it will not float in the air for a long time. Aerosol transmission can float with the wind, and the risk of transmission still exists within the range of 1-2 meters. 4. Different concentrations: The concentration of droplet transmission is higher, and the concentration of aerosol transmission is lower. 5. Different transmission conditions: Droplet transmission occurs when talking, coughing, or sneezing, while aerosol transmission mainly occurs in confined spaces, such as airplanes, elevators, cinemas, and other places with poor air flow. When ventilation conditions improve and the virus is diluted to a certain extent, the risk will naturally decrease. In general, although the new coronavirus can be transmitted through aerosols, don't worry too much. It can be prevented by wearing a mask correctly and washing hands frequently during daily travel. |
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