1, level 1
The first level is relatively easy to control, which is limited to an influenza virus that spreads among animals and is not very aggressive to people. For example, swine fever, which was popular before, only spread among animals, so the price of pork is rising.
Step 2: Level 2
Secondary is also a virus that spreads among animals, but it has been infected by humans before, so it has certain risks. Generally, this virus can find corresponding drugs to treat it, and the mortality rate for human beings is not high, and there are few large-scale infections.
3, level 3
The third level is animal-to-animal and animal-to-animal viruses, but there will be no human-to-human transmission. Therefore, if someone uses infected animals or has had contact with them, they may be infected. Such viruses generally only cause small-scale infections.
Level 4, 4
Level 4 is a virus that spreads from person to person and needs to be controlled, otherwise a large-scale infection will occur. For example, Ebola virus belongs to the fourth-grade virus, which is also a very terrible virus in the fourth-grade virus, and the mortality rate after infection is relatively high.
Level 5, 5
The V virus also spreads from person to person, and it is not limited to one country or region. For example, it may spread between Asian countries, which belongs to the definition of V virus. If there is a category five virus, we need to take immediate preventive measures to avoid global infection, and the situation will get out of control.
Grade 6, 6
The six-level virus is terrible and can be said to be a virus that can be infected all over the world. For example, it may spread between Asia, Africa and South America, thus causing global infection. However, this situation is very rare. After the virus appears in a certain area, there will be corresponding control measures, and it is difficult to spread around the world.