Epidemiology of HIV Infection in the Developing World

  • Authors: Sunil Solomon, MBBS, PhD, MPH; Suniti Solomon, MD (More Info)
  • Editors in Chief: Daniel R. Kuritzkes, MD; Joseph J. Eron, Jr., MD
  • Last Reviewed: 4/1/16 (What's New)


  • 2 types of HIV infect humans: HIV-1 and HIV-2
  • HIV-1 accounts for most HIV infections globally, whereas HIV-2 is largely restricted to Western Africa
  • HIV-1 can be further classified into 4 groups: M, N, O, and P

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