AIDS is a very harmful infectious disease, caused by HIV infection. HIV is a virus that attacks the body's immune system. It takes the most important CD4T lymphocyte in the human immune system as the main target of attack, destroys the cell in a large amount and makes the human body lose its immune function. Therefore, the human body is easy to be infected with various diseases, and may develop malignant tumors, with a high mortality. The average incubation period of HIV in human body is 8-9 years. Before HIV, people can live and work without any symptoms for many years.<br>
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