HIV is the virus that can become AIDS.
AIDS is defined as the most advanced stage of the virus, where the immune system has become so damaged that you're vulnerable to infection and cancers that come from infections. Those are called opportunistic illnesses, because they take advantage of your weakened immune system. They are often fatal.
HIV is spread when blood,
semen, or vaginal fluids from an infected person enter
another person's body, usually through sexual contact, from sharing needles
when injecting drugs, or from mother to baby during birth.
WebMD Medical Reference from Healthwise
May 16, 2013
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