virus is a protein and/or nucleic acid that can enter a host cell and replicate itself there, gradually multiplying. Most viruses are composed of a protein coat and a kind of nucleic acid (DNA or RNA), and exist in the form of particles with a diameter of about 100 nm; but prions have no nucleic acid, only protein; there are viroids that have no protein, only one kind of nucleic acid.
Generally speaking, viruses are not living organisms; if they can trigger the infection process, they are called "living" viruses. The infection process is roughly divided into five steps: 1-adsorption, 2-injection (genetic material), 3-synthesis ( reverse transcription /integration into host cell DNA), 4-assembly (using host cells to transcribe RNA, translate protein and then assemble), 5-release.
The particle surface of the new coronavirus has a similar composition to the surface of cells in the human body's nasopharynx, trachea, and bronchi. According to the principle of similarity and dissolution, cells in these organs are susceptible cells to the virus. As long as the virus reaches the vicinity of these cells, it is easy to adsorb on the cell surface (at this time, the function of the cell begins to be abnormal). It injects genetic material and some enzymes into the cytoplasm of the cell like a micro syringe, and mixes with the nutrients in the cytoplasm. The virus particles then virus particles leave the cell through exocytosis or "budding" and pass through the cell membrane without damaging it; thus the newly assembled virus is released into the environment to infect others.
In the previous stage, a picture was circulated on WeChat, which recorded: Song Yong, a respiratory expert at the Eastern Theater Command General Hospital, said: The virus can only survive inside the cells of the organism and cannot survive outside the body at room temperature. It does not make much sense to wipe the floor with 84 disinfectant , alcohol and other disinfectants . The shortest incubation period is 1-2 days, the longest is 10-12 days, and the average is 7 days. medical observation is 14 days. There is a certain degree of contagion during the incubation period. Patients are most contagious when they have high fever.
Just found from the Internet, China Military Network refuted the rumor as early as February 2020: Song Yong did not say that "the virus cannot survive at room temperature after leaving the human body." The current mainstream view is that it is necessary to disinfect indoor areas where the new coronavirus may be present.
