Are all viruses contagious? Why is the virus contagious?

Viruses, like all other living things, do not exist for any purpose, they are just alive and multiply. In general, if viruses don't pass on to the next host before they die, they're doomed. Moreover, due to the limited transmission routes and individual differences in chickens, the probability of a virus killing all chickens in the world is very small.

If it does, then these viruses will be extinct. Many viruses do not break out immediately after infection, but remain dormant in the host's genome for a long time, and only begin to replicate and assemble themselves under certain conditions, entering the infectious period. And the onset of the disease generally does not kill the host very quickly.

On the other hand, viruses with short incubation periods and high fatality rates, such as Ebola, can wipe out a village in a single outbreak, and in isolated black Africa, infected people die after not going far, and often lose their route before they can spread, so there is no large-scale outbreak around the world. However, human transportation is becoming more and more developed, and the movement of people is becoming easier and easier, and it is difficult to say what will happen to this thing in the future. <>

Types of viral infections: acute and persistent, acute infection, acute infection, which is cleared by the immune system. In order to survive, they must have the ability to quickly infect a new host, or survive in vitro.

In other words, it doesn't matter what you do if you die, anyway, its granary is there, and you can't starve to death without food. This is the truth that the wolf eats the sheep, the wolf eats a sheep and there are thousands of them waiting for him to eat, he only needs to hunt (infect the new host) and *** himself will still be alive when he catches the next sheep (in vitro survival). Persistent ** infection in the host body for long-term insidious survival.

Conditions for persistent infection: Able to infect host cells without showing curative effects. Keep your genes in the host cell for a long time.

Evades the clearance of the host immune system. In other words, the baby wants to continue to dye that he has built a grain storage station. It's like a person (virus) who has raised a flock of sheep (cells in the host's body), eats one and the next, and doesn't have to run around to hunt!

But in order for sheep to continue for a long time (persistent infection), he has to develop some methods and rules. First of all, he can't let the sheep get sick (without showing healing effect), because the sheep will die when they get sick, and once they die, they will have nothing to eat. Second, maybe the sheep will live longer than he does, until he dies and the flock is still there, and he wants to leave the flock to his children and grandchildren so that they can keep the sheep (keeping the genes present in the host cell).

Finally, the sheep sometimes rises up to try to regain his freedom, and then he has to fight with the sheep, and he can't let the sheep trample him to death, and he can't let the sheep run away, in short, the sheep is there, and he can't be separated from the sheep (to escape the host's immune clearance). The replenishment virus will gradually develop into a persistent infection after the acute **infection (originally a hunter, later a shepherd). And in the continuous infection, new individuals are constantly infected (new sheep are obtained by purchasing and hunting, and the sheep industry is developed and expanded).

1. Decreasing with distance.

As a substance, the spread of the virus will gradually decrease as the distance from the source of transmission becomes farther and farther away, that is, the various isolation measures we are doing now will increase or block the transmission distance of the virus. From a geographical point of view, the virus carrying energy and transmissibility of patients born in the place of origin are definitely much higher than those of the second and third transmissions, and the virus energy is generally in a state of attenuation.

This is also the reason why under the same conditions, the primary patient is seriously ill, and the secondary transmission patient is mild. This is what experts say, in the end of the fight, the virus continues to decay, weakens and becomes the flu, and finally the human body is more adaptable.

2. Limited energy.

For individual patients, whether they are "super individuals" or "ordinary carriers", the total amount of virus they carry is large, but it must be limited, and the amount of virus that is sporadic and transmitted is certain, and it is by no means unlimited.

The basic number of infections of the new coronavirus (SARS-CoV-2) r0 is estimated as the basic number of infections r0 refers to the epidemiological average of how many people infected with an infectious disease will transmit to others in the absence of external intervention and the absence of weakened immunity in all people.

For the public, if you can't grasp it correctly and rationally, when you see news such as ** report, a patient diagnosed in a shopping mall, and thousands of people are isolated at home, it will inevitably cause greater panic.

3. Conservation of energy.

As a substance, viruses must neither create nor disappear out of thin air, but can only be passed from one carrier to another, and the energy forms can be converted into each other. Whether it is Western medicine, traditional Chinese medicine, or the combination of traditional Chinese and Western medicine** program, as far as the new crown pneumonia virus is concerned, it cannot disappear in itself, but the transformation of material form and energy form.

In the case of acute disease, Western medicine mainly kills the virus; In the case of remission, traditional Chinese medicine mainly recuperates and transforms. In the end, whether it is an artificial virus or a naturally evolved virus, it must be adapted by the human body, tolerated and transformed, and lived in peace. Therefore, blindly killing viruses is not the source and system of curing and fighting.

Judging from the best effect of hospitals in Wuhan and Guangzhou, where the disease occurs, traditional Chinese medicine is the mainstay, and the combination of traditional Chinese and Western medicine is better.

This is for patients with more than two transmissions, as well as non-severe patients in other regions, traditional Chinese medicine will be able to play a greater advantage, which means that when the substantive Western medicine drugs and vaccines have not yet come out, we can use our housekeeping skills to prevent and improve the new coronavirus pneumonia, so as to protect the health of more people, and perhaps explore more possibilities.

Attitude towards the virus.

We should have scientific judgment and cognition, despise it strategically, attach importance to it tactically, and reduce the needless panic of the broad masses of the people. We will continue to maintain a calm and rational attitude, take the initiative to act, adhere to the "two-legged" walk, pay attention to scientific prevention, resume work and production in an orderly manner, reduce the impact of the epidemic on the economy as much as possible, and strive for early annihilation. Because, the collective excessive panic will increase the anxiety of the whole society, amplify the cunning and horror of the virus, and make things worse.

Yes, it is only through infection that the virus can multiply to the next generation.

A virus is a non-cellular microorganism that contains only one nucleic acid (DNA or RNA) and must parasitize and replicate in living cells.

A virus is a non-cellular life form, it is composed of a long nucleic acid chain and a protein coat, and the virus has no metabolic mechanism of its own, no enzyme system. As a result, when the virus leaves the host cell, it becomes a chemical substance that has no life activity and cannot reproduce on its own. Once in the host cell, it can use the matter and energy in the cell, as well as the ability to replicate, transcribe, and translate, to produce a new generation of viruses like it based on the genetic information contained in its own nucleic acids.

Viruses are divided into plant viruses, animal viruses, and bacterial viruses. Structurally, it is also divided into: single-stranded RNA virus, double-stranded RNA virus, single-stranded DNA virus and double-stranded DNA virus.

Virus, like all organisms, has the ability of heredity, mutation, evolution, is a very small size, extremely simple structure of life form, virus has a high degree of parasitism, completely dependent on the host cell's energy and metabolic system, access to the material and energy required for life activities, leaving the host cell, it is just a large chemical molecule, stop moving, can be made into protein crystallization, for a non-living body, encounter the host cell it will be adsorbed, enter, replicate, assemble, The virus is a primitive life form between living and non-living organisms because it releases progeny viruses and shows typical characteristics of living organisms.

Viruses that can infect humans make up only a small fraction of the entire virus family.

The virus itself does not have a reproduction system, it is all reproduced through parasitism, so it is infectious, infectious diseases are infected by bacteria, and they are not viruses.

A viral infection is when the virus uses you as a place of nutrients, replicates in your body, and can then have a bad effect on you.

Whether contagious or not is contagious depends on the nature of the virus and your concept of contagion.

Of course, the virus is contagious, and it is very common to pass it through saliva or something.

There are three ways to transmit HIV, as you know, it is easy for some people to prevent, but for others it is impossible to prevent it, and it is a personal problem.

In any case, there is definitely an opportunity to inoculate the virus into your body, but the difficulty is different, and each virus has its own nature, so if you need to know about it, you should take a look at it