What are the strains of HIV, and which is most commonly observed in acquired immunodeficiency syndrome (AIDS)?

Updated: Mar 05, 2020
  • Author: Delia M Rivera, MD; Chief Editor: Russell W Steele, MD  more...
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Although 2 strains of HIV have currently been identified, most patients who have AIDS are positive for HIV type 1 (HIV-1) or are positive for both HIV-1 and HIV type 2 (HIV-2). HIV-2 infection is most commonly observed in West Africa.

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