There are some truths you need to know. novel coronavirus’s means of infection have been exposed.

This Spring Festival, we have not had a good year, because of novel coronavirus.

At the request of the government, weNo New Year greetings, no dinners, wearing masks when going out, and washing hands frequently when going home.

We know these requirements, but we don’t know why.

This has led to some people being scared, extremely sensitive, and feeling that they are being poisoned all day.

There are still some people who don’t take it seriously at all. They can’t even wear masks at any time.

Today I’m going to give you a lecture on popular science.How did novel coronavirus infect ordinary people?　

one

In novel coronavirus, the transmission route adopted is the most awesome air transmission.

The reason why air transmission is so severe is that it is concealed, but in fact, the scope of infection is not large.

Can be spread through the air, can be described as pervasive, the scope of infection is not large?

In my articles on pneumonia in Wuhan these days, I once told you that the so-called air transmission is not through the air in essence, butTransmission by droplets.

The virus can’t exist alone without the carrier. Without the droplet, it is nothing.

The infectivity of droplet transmission is the strongest within 3 meters, and the maximum is no more than 10 meters. Generally, 5 meters is very safe.

In fact, the mode of infection of pneumonia in Wuhan is highly similar to that of a cold. If there are no droplets, there is no infection.

Most of the droplets are produced by sneezing.

What exactly is a droplet?

Here is a video about the secret of cold infection. I think it is very good. It is also applicable to replace the cold with coronavirus.　

Humans evolved the ability to sneeze, which was originally intended to drive away the dirty things attached to the nasal mucosa, but this function was used by viruses and became the best means of virus transmission.

When a sneeze goes down, countless viruses and bacteria spread along the droplets within 10 meters around, which is droplet propagation.

In a closed environment, these droplets can even exist in the form of aerosol, hovering in the air for several hours without landing, and being continuously inhaled by you.

The British "Daily Mail" once reported:

People suffering from upper respiratory diseases such as colds sneeze indoors in public places, and the pathogenic microorganisms contained in them can attach to handrails, seats, door handles and other places where people are constantly scratching and touching them within 2 seconds, and can infect 150 people with cold virus within 5 minutes!

This is the reason why we look for "close contacts" and ordinary people in the same car as the patients as soon as we find the infected people.　

Moreover, this droplet can not only be inhaled by you through the respiratory system, but also spread through the conjunctiva if a large droplet happens to fall in your eyes.

Some time ago, a medical expert was infected through his eyes, and the source was the patient’s droplets.

The best way to deal with this kind of droplets is to wear a mask.

The body of the virus is nano-scale, so tiny that no mask can stop it.

However, the virus must be attached to droplets to have the vitality to spread, which makes it possible to stop the virus.

Take N95 mask as an example. This mask has a blocking rate of more than 95% for particles of 0.3 micron, and the size of droplets, generally 1~5 microns, can be easily blocked by N95 mask.

Stop the droplets, we stop the virus.

Except N95, most ordinary masks actually have strong protective functions.Even if you cover it with a towel, it’s much better than nothing.

Anything that can stop the droplets is meaningful to isolate the virus.

Wearing a mask contributes a lot to the eradication of coronavirus. On the one hand, it can protect you from the virus, on the other hand, it can limit your own sneezing within the mask to protect others.

This double protection makes the mask a well-deserved epidemic prevention artifact.

In addition, although coronavirus is spread by droplets, if this droplet floats on your hands and you rub your eyes, touch your nose and lips without washing your hands when you go home, you will be infected as well.

Therefore, it is obviously an airborne coronavirus. Besides wearing a mask, you are also required to go home and wash your hands. This is the reason.

Say so much, is to let you go out and wear a mask honestly, don’t take any chances, a sneeze can spread millions of bacteria and hundreds of millions of viruses.

But you don’t need to panic too much, because the human body is naturally extremely resistant to all viruses, even novel coronavirus.　

2

As I said just now, a sneeze can spread hundreds of millions of viruses and instantly fill all the spaces around a few meters.

Can these viruses infect hundreds of millions of people?

Dream, it’s good that such a small amount of virus can infect one or two people.

Many people think that as long as they come into contact with the virus, they will die.

But in fact, even if the virus is new and infectious, it needs a certain amount to infect human beings, and sporadic viruses are useless.

Even with HIV, not everyone who comes into contact with HIV will get sick. The more the first contact, the greater the probability of getting sick.

A virus can infect the human body and then spread to the whole human being. This kind of thing only exists in science fiction.

After successfully infecting human body, bacteria will divide once every 20~30 minutes, and the number will double.

One E.coli, assuming that it reproduces every 20 minutes, how many E.coli can you guess after two days?

After 8 hours, you will get 16.77 million Escherichia coli.

After 10 hours, you will get 1.07 billion E. coli.

I won’t list the figures behind, there are too many zeros, and it doesn’t make sense for you to read them.

In two days, you will get a big lump of E.coli, the total weight of which will exceed that of the earth. . .

Viruses reproduce much faster than bacteria.

Therefore, it is impossible for the human body to allow bacteria and viruses to multiply at such a high speed. If they continue to multiply at this speed, even beneficial bacteria can kill people within 24 hours, because the nutrients in your whole body are not enough for bacteria to use.

The only reason why you were not killed by germs within 24 hours is because your immune system works all the time, successfully suppressing germs and destroying their breeding environment.

It takes time for the human immune system to respond. It needs to identify abnormal proteins in the body and issue instructions, so that immune cells can have a clear target without accidentally injuring ordinary cells.

Bacteria and viruses that invade the human body need to breed a considerable number before the immune system reacts, in order to survive the first wave of encirclement and suppression of the white blood cell army.

It is inevitable to be constantly killed by white blood cells, but as long as the number of new reproduction exceeds the number killed by white blood cells, it means that the bacteria have successfully gained a foothold in you.

The immune system in your body will raise your body temperature, destroy the breeding environment of germs, and issue a national general mobilization order to mobilize all resources to expand the leukocyte army and carry out a new round of encirclement and suppression.

In other words, you are ill.

So just a few hours before the invasion of the human body, it is extremely critical that the base number of bacteria must be large enough to take the opportunity to breed a sufficient number in these short hours. So as to gain a foothold and survive the first wave of encirclement and suppression of white blood cells.

1 virus, and 10 thousand viruses, the difference is really too far.

Although in the later stage, you can spread hundreds of millions of viruses with a sneeze, 10 thousand viruses are worthless.

But in the early stage, the gap between 1 and 10 thousand is the gap between life and death.

The base of the invasion is large enough to be called a virus.

If the invasion base is not large enough, it becomes a vaccine. . .

As long as you isolate a large number of droplets through the mask and reduce the virus entering the body below the threshold, even if you encounter a small number of viruses, you will be fine.　

three

The reason why viruses and bacteria multiply so fast is that their mortality rate is too alarming.

In the human body, they are hunted by the immune system.

After leaving the human body, they die even worse.

When you sneeze, the virus in the droplets will lose its infectivity in the sun for only a few minutes. In the dark, the appeal can only last for a few hours.

On the surface of common objects, the infectivity can last for two or three days, and it can last up to 10 days in excrement.

Viruses are indeed more infectious than bacteria, but their viability is much weaker.

Spraying disinfectant in the form of aerosol can effectively destroy the environment inside the droplets and lead to virus inactivation.

And if in a ventilated open area, although the droplets will spread further, the virus density will drop geometrically and will soon fall below the pathogenic threshold, so the hospital pays great attention to ventilation and disinfection in order to reduce the virus density.

In ordinary environment, 3~5 meters is enough to ensure your safety.

According to the latest news on January 27th, Ceng Guang, a member of National Health Commission high-level expert group, expressed his attitude towards two cases of infants in Beijing. In principle, everyone is susceptible.

Coronavirus is terrible, highly contagious, and the route of transmission is hidden, and no matter men, women and children are spared.

But as long as we wear masks, wash our hands frequently and disinfect more, we will keep a distance of three to five meters from everyone.

Even if the few remaining coronaviruses enter your body,The end result can only be a vaccine. . .

Again:Wear a mask, wash your hands frequently, and disinfect more, three to five meters.

Original title: There are some truths that you must know. The means of infection in novel coronavirus are exposed.

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