Since National Health Commission released the "Diagnosis and Treatment Plan for the New Coronavirus Pneumonia (Trial Ninth Edition)", the word " aerosol transmission " has remained high. Many people do not understand what aerosol is , and what is the transmission of aerosols. The editor will explain your doubts about this.
1 What is aerosol?
aerosol refers to a system composed of tiny particles with solid or liquid particles suspended in a gas medium and a diameter between 0.001 and 100 microns. It is a tiny particle that floats in the air and does not fall off easily. Clouds, fog, and smoke are all aerosols. The core of haze is also an aerosol.
In layman's terms, there are many suspended objects in the air that are invisible to the naked eye. Although these suspended objects are large and small, they are of various sizes, but if compared with the diameter of hair, they can be roughly divided into two categories: suspended objects with thinner diameters than hair and thicker diameters than hair and thinner diameters than hair are called aerosols. To give a specific example, you are walking on the road and there is no one around you, but you smell the smoke. This is the aerosol of about hundreds of nanometers formed after the tobacco is burned.
2 What is aerosol propagation?
The new coronavirus with a diameter of about 0.1 microns can be attached to dust, droplets, or droplet nuclei that lose moisture, and "air transmission" in the form of an aerosol, which is aerosol transmission.
aerosols are common in living environments, including natural and man-made environments. Naturally generated aerosols such as mist, dust, smoke, etc. do not last long and carry relatively few health hazard components. In an artificial environment, it is complicated. Sneezing, smoking, exhaust emissions, production operations may produce aerosols, and even breathing can produce trace amounts of aerosols.
people cough, spit or sneeze, droplets sprayed from their bodies are large and small. Large-mass droplets and dust will soon fall to the ground, while small-mass droplet cores are almost not sinking in the air. Moreover, the coronavirus in the droplet core is protected by a protein membrane shell and can remain active for a considerable period of time. Therefore, the aerosol can float to a further distance, causing long-distance transmission. Others are prone to infection if they inhale aerosols with high concentrations of viral particles.
3 Is the possibility of aerosol transmission very high?
aerosols are common in the air and are produced when talking, laughing, and sneezing. They are small in size and light in weight, and will carry viruses to float in the air for a while before landing. Speaking of this, everyone suddenly became a little scared. The air was full of virus aerosols, dense and lingering.
is not the case, and everyone is overly worried. Toxicology famous quotes in the world of have always been very popular: put aside the dose and talk about toxicity, it is all about being a hooligan! Experts said: "When there are no close-range patients droplets nearby, healthy people have a lower chance of infection than traffic accidents." The virus needs to reach a certain concentration before it can cause infection and illness. However, the concentration of virus aerosols in the air is low, which is far from the level of disease.
At home and office, the space is relatively closed. The aerosols mostly come from people (cough, sneeze, talk, etc.) and people's activities (cooking, smoking, going to the toilet, etc.), and the concentration is generally higher than that outside. If there are suspected or confirmed patients, be sure to isolate them alone and send them to the hospital as soon as possible. When
is outside, it is necessary to pay attention to the fact that in areas where people gather, especially in public places such as vegetable markets and transportation hubs, the concentration of aerosols from artificial sources is often higher, and the probability of carrying viruses will also increase accordingly.
4 How to prevent aerosol propagation? The spread of
virus through aerosols increases more uncertainty and obscurity. Aerosol transmission makes it more difficult for people to prevent, but it is not impossible to prevent.
Source: Public Health and Preventive Medicine, Shenzhen Health Commission, Zhejiang Health Education
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Editor: Jiang Hui Editor: Jiao Yafeng Li Xiu
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