For many years that I have known about HIV/AIDS disease. I think it is the most dangerous disease in the world that I know. In the world have many people have HIV/AIDS disease and government have an organization to help HIV/AIDS's victim. Some people infected HIV/AIDS disease from their parent. Some people infected HIV/AIDS because they have sexual intercourse with courtesan.
Nowadays, we have many ways that you can do to protect yourself from HIV/AIDS disease such as use condom everytime when you have sexual intercourse with other people or don't use a syringe with other people.
For more information : http://emedicine.medscape.com/article/211316-overview