how's the virus will die? what happened after a single virus infect a host cell?

Answer 1

If i was you I'd work more on my english before delving into biology

Answer 2

Normally when a virion comes in contact with a host cell, only the viral nucleic acid enters the host cell.
( RNA/DNA- depending upon the type of virus - in general plant viruses are RNA viruses and animal viruses are DNA viruses, of course there are some exceptions in both the cases as cauliflowermosaic virus is a DNA virus).
Using the host cell's enzymes ( via complex mechanism by controlling the host DNA), the viral proteins and replication of viral nucleic acid takes place. This is then followed by a process in which the viral components synthesized in the host cell are assembled to form complete infective particles. The bulk of these particles exert pressure on the host cell wall ( not only physical but biochemical too), bursting the cell and releasing the virus to repeat this cycle.
This is known as the Lytic cycle.

In some cases ( you must have read transformation- transfer of genetic material from one cell to another), bacteriophages act as vector for tranfering genetic material from one cell to another. In this case , the bacteriophage ( virus infecting the bacterial cell) does not undergo lytic cycle as decribed above but another process known as Lysogenic cycle. Here the viral nucleic acid alongwith the genetic material from the donor cell attaches to the host DNA and lives for some time as if it is a part of the Host DNA. After a few generations, this portion is detached from the host DNA and then completes the lytic cycle. Here when the detachment takes place some portion of host DNA is carried by viral NA.

Now the first part of your question.
Viruses are obligate parasites. They need a living host cell for their survival and multiplication. In the absence of host cell, the multiplication ( reproduction) of the viral particle stops which is an essential feature to catogorise it an a living entity. I hope you understand . In the free environment they may remain dormant till they get the host cell. If the environment is adverse , say very high temperature, the particles may denature and get desroyed.

How about designing a drug for killing the viral particles. I personally feel it is really difficult but with modern techniques it is just possible. It is difficult, as you know it is only the nucleic acid that enters the host cell. A drug will have to be designed that should be able to differentiat the differences between the host nucleic acid and the varal nucleic acid, otherwise it will destroy the host NA also. It will be like a fireman who was called to extinguish fire in a but but pours and forces so much water that the fire is extinguished but the hut is destroyed too.

Answer 3

What happens is the virus enter the host cells nucleus and nuclei and mutates the cells DNA to reproduce more of the virus. Then those cells infect other heathy cells. Virusus don't die what they do is become dormant (meaning they almost go to sleep)....However, anything in your body can trigger its reproduction again making the virus active. If you notice vaccines are only effective if given before a person gets a virus that way the body can produce anti-bodies against this virus.

Answer 4

When a virus infects a host cell it hijacks it to make more copies of itself. After that it basically dies...viruses aren't technically living in the traditional sense. When a bunch of copies are made in the host cell it bursts and releases more viruses.