AIDS
AIDS virus called HIV, is a body’s immune system to attack the virus. It is the body’s immune system, the most important target T4 lymphocytes as a large number of swallow, destruction T4 lymphocytes, thus undermining the person’s immune system and ultimately the collapse of the immune system, so that the human body due to the loss of resistance to various diseases and the incidence of and death. Scientists put the virus called “human immunodeficiency virus.” AIDS virus in the human body average incubation period of 12 years to 13 years. In developed into AIDS patients before the appearance of seemingly normal, they can not have any symptoms for many years to live and work.