HIV virus can cause AIDS and make human's immune system to fail. It can be transfered by unsafe sex, body fluid and contaminated needles. It is a dangerous virus and has killed more than 25 million people from 1981~2006.
One of the risky part for HIV virus is that whenever a person gets it, the symptons are quite similar to that of common flu. Therefore lots of people don't pay much attention to the risk, which leads to a more dangerous condition of human bodies.
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