People may get sick several times after being born until it dies. There are people with a handicap by nature, and, of course, there is a person who makes a living without getting sick also at once.
Therefore, the whole life will be finished in many cases sick. There is a various causes of sick. "virus " I think it a general thing that doing of this is large.
Then, how can we stop the action of this virus? In the present age when medicine progressed, before being damaged by such virus, we have the technology of protecting in advance.
It was not simply damaged by the attack of a virus, but very wonderful organization is ready on our body.
Moreover, there is infection which can be prevented if it takes care when we live.
Here, we study about structure of repulsing virus --- "immunity", and we want to consider AIDS which is the talk now, and SARS which was in fashion in 2003 to 2004.
