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  1. HIV/AIDS - Symptoms and causes - Mayo Clinic

  2. About HIV/AIDS | HIV Basics | HIV/AIDS | CDC - Centers for …

  3. HIV - Wikipedia

  4. What Are HIV and AIDS? | HIV.gov

  5. HIV and AIDS - World Health Organization (WHO)

  6. HIV Basics | HIV/AIDS | CDC - Centers for Disease Control and …

  7. HIV and AIDS: The Basics | NIH - HIVinfo

  8. HIV/AIDS - Wikipedia

  9. HIV | CDC - Centers for Disease Control and Prevention

  10. HIV/AIDS - World Health Organization (WHO)