AIDS is the acquired immunodeficiency syndrome. The virus responsible for AIDS is called Human Immunodeficiency Virus (HIV). In many cases, the HIV is infected. The most common causes are sexual contact with an infected person, contact with blood, subcutaneous milk and breast milk. A person may be contaminated with HIV for many years before the onset of AIDS. Unawareness of people about AIDS, HIV and its symptoms. Early detection of symptoms can help delay the onset of AIDS.