What are the types of viruses that viruses are divided into?

From the classification of genetic material: DNA viruses, RNA viruses, protein viruses (e.g. prions).

Classification from virus structure: euviruses (viruses for short) and subviruses (including viroids, viroids, prions).

Classification by host type: bacteriophage (bacterial virus), plant virus (e.g. tobacco mosaic virus), animal virus (e.g. avian influenza virus, smallpox virus, h, etc.).

In terms of nature, it is divided into mild viruses (H) and virulent viruses (rabies viruses).

Viruses are a class of non-cellular microorganisms with very small particles, measured in nanometers, simple in structure, and strictly parasitic, and reproduce by replication. Viruses are microorganisms that are smaller than bacteria, have no cellular structure, and can only multiply in cells. Consists of proteins and nucleic acids.

Most of them can only be observed with an electron microscope.

Originally refers to a toxin in animals. The word is of Latin origin. Viruses are capable of proliferating, genetically evolving, and thus possessing the most basic characteristics of life, and there is still no accepted definition of them. Its main features are:

The body is extremely small and can usually pass through a bacterial filter, so the virus is called a "filtered virus" and must be observed under an electron microscope.

There is no cell structure, and its main components are only nucleic acids and proteins, so it is also called "molecular biology";

Each virus contains only one nucleic acid, either DNA or RNA.

There is no productive enzyme system, no protein and nucleic acid synthase system, and only the ready-made metabolic system in the host's living cells can synthesize its own nucleic acid and protein components.

The assembly of "elements" such as nucleic acids and proteins achieves mass reproduction.

Under the condition of in vitro, it can exist in the state of inanimate biological macromolecules, and maintain its infection vitality for a long time.

Not susceptible to general antibiotics but sensitive to interferon.

Some viral nucleic acids can also integrate into the host's genome and induce latent infection.

1. According to the ability of virus destruction, it can be divided into the following types: 1. Harmless: except for reducing the free space of the disk during infection, it has no other impact on the system.

2. Non-dangerous type: This kind of virus only reduces memory, displays images, emits sound and similar sounds. 3. Dangerous type:

This type of virus causes serious errors in the operation of computer systems. 4. Very dangerous: This kind of virus deletes programs, destroys data, and clears the system memory area and important information in the operating system.

2. The methods of viral infection can be divided into resident viruses and non-resident viruses. Extended Information: According to the virus-specific algorithm, viruses can be divided into:

1. Companion virus: This kind of virus does not change the file itself, they produce the companion of the exe file according to the algorithm, with the same name and different extension (com), for example: the companion is ***com.

When the DOS loads the file, the adopter is executed first, and then the adjunct loads and executes the original exe file. 2、"Worms"Virus: Spreads through the computer network, does not change the file and data information, uses the network to spread from the memory of one machine to the memory of other machines, calculates the network address, and sends its own virus through the network.

Sometimes they exist in the system and generally do not occupy other resources except memory. 3. Parasitic viruses: in addition to concomitant and"Worms"Other viruses can be called parasitic viruses, which are attached to the boot sector or file of the system and spread through the functions of the system

4. Practice virus: The virus itself contains errors and cannot be spread well, for example, some viruses are in the debugging stage. 5. Mysterious virus:

They generally do not directly modify DOS interrupts and sector data, but are modified internally through DOS such as device technology and file buffers, which are not easy to see and use more advanced technologies. Work with DOS free data areas. References**: