epidemic prevent prevent control
prevent aerosol transmission
aerosol know how much
According to the National Health Commission’s "Diagnosis and Treatment Plan for the New Coronavirus Pneumonia (Ninth Edition)" we can understand that there are three ways of transmission of the new coronavirus:
. Transmission through respiratory droplets and close contact is the main transmission route
. Transmission through aerosol in a relatively closed environment
. Contact with items contaminated by viruses may also cause infection
1
What is aerosol?
aerosol (aerosol) is a colloidal dispersion system formed by a solid or liquid small particle and suspended in a gas medium, also known as gas dispersion system . The size of aerosol particles is usually between 0.01 and 10 μm, and can be suspended in the air for a long time and cause migration. For example, when you sneeze indoors, if sunlight shines into the house, you can see small floating droplets.
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 loses moisture, and "air transmission" in the form of an aerosol, which is aerosol transmission.
When people cough, spit or sneeze, the 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.
In an unventilated environment, the aerosol containing the virus will stay in the air for a long time. For example, after a patient takes an elevator, there may be viral aerosols in the elevator. Due to poor air circulation, if healthy people then enter the elevator, the risk of infection will increase.
3
How to protect it?
No.1 How to prevent public places?
Wear a mask scientifically, wash your hands frequently, keep a safe distance of more than one meter from others, strictly follow the prevention and control requirements, and cover your mouth and nose with tissues or elbows when sneezing or coughing.
No.2 How to prevent a relatively closed environment?
Aerosol indoor transmission risk is greater than outdoors. Most viral infections occur indoors, and the proportion of indoor transmission of household clustered epidemics is even greater, so home prevention is particularly important.
. Keep the window open for ventilation
. Ventilate at least once in the morning and afternoon at home. each ventilation time for each ventilation at least 30 minutes. air circulation can effectively eliminate the spread of aerosol in a confined space. If you have centralized air conditioning at home, remember to turn on fresh air mode.
. Pay attention to sewer pipes and flue
When the sewer is too dry or has no return water curve, it loses protection. The aerosol in the sewer public pipeline may enter the homes up and downstairs of the same unit with the airflow. Timely ensure that water is stored in the backwater curve, and the water will seal the pipeline and effectively prevent aerosols from entering.
toilet and shower drain should be equipped with water sealing device to replenish water in time, inject water more than 2 times a day, each time should not be less than 350ml, to prevent the aerosol from diffusing through the pipeline. If the floor drain does not have water sealing conditions, it should be covered and blocked after use, or blocked with silicone pad , tape and other materials, or a plastic bag is filled with water and tied tightly, and placed on the floor drain as a sealing cover.
drainage pipe of utensils for utensils such as utensils should be closely connected to the drainage system. If plug-in connection is used, sealing should be done. When flushing the toilet, cover the toilet lid first and then flush it. avoid aerosol splashing outside the toilet.
In the bathroom, should strengthen the ventilation of the windows to keep the air flowing; If there is no natural ventilation conditions, the exhaust equipment must be turned on for ventilation.
Remember to open the window for ventilation when cooking to avoid flue airflow. If there is check valve in the exhaust duct, there is no need to open the window.
No.3 Indoors need to be cleaned frequently
Wet cleaning at least once a day (it is a method of using the washing liquid to fully contact the dust-containing gas, washing the dust particles and purifying the gas), and disinfection is carried out if necessary. Especially the bathroom and kitchen, it must be kept clean.
Whether indoor or outdoor,
Everyone should strictly abide by prevention and control requirements.
Wear a mask, wash your hands frequently, and keep a distance of one meter from
.
Do your life details well,
You and I are all forces in fighting the epidemic.
Text source: Healthy Beijing, CCTV News, Healthy China, Shanghai Disease Control
