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AIDS is infected with the human immunodeficiency virus (HIV) after a death caused by sexually transmitted diseases. The incubation period is generally six months to 8-10 years. There are more than 40 million HIV-infected people. the number is as high as more than five million new infections a year, more than three million dead. But so far, Mankind has not yet found a way to cure the disease. AIDS clinical manifestations can be divided into four types : 1. 2 breathing difficulties. headaches, unconsciousness, dementia, seizures, and lead to serious consequences. 3. Gastrointestinal water will be spilled, four times a day 10-20. Fever of unknown causes AIDS prevention : 1. popularize AIDS prevention knowledge so that people understand the etiology of AIDS, transmission, clinical performance. 2, the blood donor for HIV testing, while minimizing the use of blood products. Blood products must be made at first. 3, the sharing of needles and syringes and toothbrushes, razor blades and othe