What is the difference between HIV and AIDS?

HIV is the viral infection that leads to a diagnosis of AIDS. Once someone is infected with HIV, it usually takes about 7 to 10 years for their immune system to be compromised to the point of an AIDS diagnosis, specifically their CD4+ T-cell count is less than 200 per millimeter of blood and/or they have an onset of one Opportunistic Infection. Usually, CD4 cell counts in someone with a healthy immune system range from 500 to 1,800 per cubic millimeter of blood.

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1. What is the difference between HIV and AIDS?
2. What is an Opportunistic Infection (OI)?
3. Where did HIV come from?
4. How is someone infected with HIV?
5. Can I get HIV from casual contact with someone who is infected?
6. How can someone reduce the risk of being infected with HIV?
7. How does someone know if they are infected with HIV?
8. What are the symptoms of HIV infection?
9. Is there a cure for HIV?
10. Does everyone who has HIV eventually develop AIDS?
11. Where should someone begin if they want to get HIV care?
12. When should someone start taking HIV treatment?
13. How much does HIV care cost?
14. If someone is diagnosed with AIDS, does that mean they will die soon?
15. If someone is HIV positive, what else can they do to stay healthy?