It has been more than two years since the outbreak of the new crown epidemic, and the “three-piece set” of wearing masks, washing hands frequently, and 1-meter thread has long been known to every household, but from the current reality, not everyone can do it. On March 15, Pan Chenwei, director of the Department of Infectious Medicine and director of the Fever Clinic of the Second Affiliated Hospital of Wenzhou Medical University, said in an interview that standard wearing of masks can not only prevent the spread of the virus, but also prevent being infected, with “double protection”. effect.
Masks block and filter viruses
Prevents both transmission and infection
Previously, a confirmed case in Xi’an was infected by a mouthful of sputum. In this regard, Pan Chenwei explained that a mouthful of phlegm can indeed cause transmission. For cases in the detoxification period, in the process of coughing, spitting, or sneezing, the large particles of the droplets sprayed from the body will directly sink to the ground, and some small particles will be suspended in the air to form aerosols. People passing by will inhale aerosols and cause infection without wearing a mask.
To prevent the new crown, everyone knows to wear a mask, but why can a mask prevent infection? Experts say that even a small mask can play a big protective role, because the mask has a two-way isolation protection function. “It should be noted that the masks mentioned here are medical surgical masks or N95 masks, etc.”
Experts further explained that masks are composed of non-woven fabrics and melt-blown fabrics. On the one hand, these special materials can block the virus in the droplets exhaled by the wearer and prevent the spread; on the other hand, they can prevent the spread of the virus. Isolate the virus from the outside world and protect the wearer.
Studies have shown that as long as both parties wear masks and are separated by more than 1 meter, the chance of infection is almost zero.
Wear a mask to show nose or chin
It is equivalent to issuing a “passport” to the virus invasion
It is very important to wear a mask, and it is even more important to regulate the wearing of masks. Pan Chenwei said that wearing a mask to show the nose or pull the chin up is equivalent to issuing a “pass” for the virus to invade.
Experts reminded that masks should be worn strictly and the nose clip should be clamped. Generally, a mask should be replaced every 8 hours; Wearing a mask is strictly standardized to ensure your own safety and to protect others. In view of the highly contagious characteristics of Omicron, it is recommended to wear a mask outdoors, except in an open and unmanned place, you should wear a mask in other places.
1 meter line is a safety line
It is calculated from the droplet parabola
Why maintain a 1-meter social distance? Is 0.5 meters unsafe? In this regard, Pan Chenwei replied that the 1-meter line is a safety line, which has a scientific basis. “The parabola where the droplets come out from the mouth and nose to the ground, the calculated distance is within 1 meter.” This means that the probability of inhaling other people’s droplets will be very high if the close contact is less than 1 meter.
In the prevention and control of the epidemic, there are many places that need to implement the 1-meter line. Experts give an example. Citizens should take the initiative to maintain the 1-meter line at nucleic acid sampling points, hospital registration windows, queuing halls, supermarket shopping checkout channels, farmers markets, hotel entrances, etc. when queuing. There is also the canteen of units and companies. It is not realistic to have one table per person, so it is necessary to set up baffles on the table to ensure the safety of people eating face-to-face.
Experts remind that people should be vigilant and not worry too much about the repeated epidemics. The most important thing for ordinary citizens is to do personal protection. Wear a mask, don’t gather, keep one-meter noodles, and seek medical attention in time on the basis of good protection when symptoms appear. If you have done your own protection, the probability of being infected is very small.
Wenzhou News Network
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