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HIV is the virus that causes AIDS, the most advanced stage of HIV disease. A weakened immune system caused by HIV will allow opportunistic infections (OIs) to develop. A healthy immune system would normally fight these infections, while an HIV-weakened immune system is susceptible to them.

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 Get the Facts
1 What is HIV?
2 What is AIDS?
3 What is the difference between HIV and AIDS?
4 How does someone get HIV?
5 How does someone know if they are infected with HIV?
6 Can you tell if someone has HIV or AIDS by looking at them?
7 Who is at risk for HIV?
8 Is there a cure or vaccine for HIV/AIDS?
9 Are there treatments and medicines for HIV/AIDS?
10 Is there a link between HIV and other sexually transmitted diseases (STDs)?
11 What is the risk of HIV and other STD transmission from oral sex?
12 Can I get HIV from casual contact with someone who is infected?
13 How do I reduce my risk and protect myself from HIV?
14 What can I do to help in the fight to end HIV/AIDS?