Introduction to HIV and AIDS

  • The basics
  • Origins of the HIV epidemic

    The history of the HIV/AIDS epidemic, including how AIDS and HIV were first detected, early theories about the cause of the disease, and information on where HIV came from.

  • Definitions

    A description of how the stages of HIV disease have been defined by the United States Centers for Disease Control and Prevention (CDC) and the World Health Organization (WHO), and how these definitions have changed over time.

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