Viruses have a very interesting infection mechanism. They are quite different from all the other organisms as they are living only inside the host but non-living outside waiting to become active again by infesting a host. They are thus rightly called the bridge between living and non-living organisms.
Now if we see the mechanism of infection of the virus we find that a virus may enter the human body (host in this case) through any open route such as nose or mouth and even undressed wounds which have a deep orifice. Now once the virus is inside the body it will attach itself to the external surface of kind of cell it is specialized to target. These cells are called target cells. Then it forces its way through the host cell and once inside the cell. They seize the protein synthesis machinery of the cell and turn it around to synthesize viral proteins that are required for their further proliferation. Viral parts such as the external coat made out of capsid protein, the viral DNA or RNA, the tail fibres and the basal fibres are assembled after its synthesis in one of the host cells forming a number of new viruses ready to attack. Cell lysis takes place where the cell bulges and ruptures releasing huge number of viruses in the body which move on to affect the other host cells multiplying at a geometric rate all the while. Thus infecting the person and causing a viral disease.
Its affect on human body
Viruses affect the human body by destroying or interfering with the fuctioning of a large number of important cells that are required for the normal functioning of the human body. Viruses may damage the cells in three different ways:
Upsetting the chemical balance and keeping the cell from producing energy to survive
By triggering Apoptosis that kills the cells
If the viral infection is recorded at a chronic rate then it may transform some of the normal cells into cancerous cells which may lead to carcinoma.
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