When virus enters human body it starts to fight against the virus, at the beginning at level of non-specific immunity then do appear antibodies. Antibodies do neutralize virus and the disease finishes.
However, it is not so easy as it looks at the first sight. In some cases during the time necessary for antibodies production the virus manages to cause many destructions in the body which leads to severe complications. Sometimes virus enters the human body, infects particular cells and stops his existence. It means that virus is in the body and it really is found in particular cells but this causes no disease – virus does not multiply, it stays in the cell waiting until the immunity weakens.
If virus is able to actively multiply it quickly leads to death and destruction of cell he captured. From destroyed cell they get into blood where antibodies are waiting for them. Thus it happens that active viruses cause acute contagious diseases (rubella, measles, mumps) which last all the time that body needs for antibodies production.
Terms for antibodies production are absolutely determined and as a rule it is 5 – 10 days, therefore it always may be said how long a man will be diseased with measles and when the rash would disappear. The doctor always knows after how many days a patient diseased with rubella would feel better. So if influenza lasts three weeks it means that it is not influenza.
The fact that viruses are found in cells of human body determines major complications in treatment of any viral infection. It is very difficult to destroy virus and leave the cell alive. Not surprisingly, there are few antiviral medications and all of them them are quite specific – it means they act against a particular virus (for example, Tamiflu acts against viruses of group A) or group of viruses (Acyclovir - against all herpes viruses). It is clear that main principle of viral infections treatment is to help body to fight the virus.
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