The World Health Organization (WHO) classifies HIV infection into 4 stages:footnote 1
The U.S. Centers for Disease Control and Prevention (CDC) classifies untreated HIV infection into 3 stages:footnote 1
In general, the higher the CD4+ count, the less likely it is that opportunistic diseases will occur. Most people who have untreated HIV experience a gradual drop in the number of CD4+ cells. Each person responds uniquely to this decline.
Schneider E, et al. (2008). Revised surveillance case definitions for HIV infection among adults, adolescents, and children aged < 18 months and for HIV infection and AIDS among children aged 18 months to < 13 years—United States, 2008. MMWR, 57(RR-10): 1–12. Also available online: http://www.cdc.gov/mmwr/PDF/rr/rr5710.pdf.
ByHealthwise StaffPrimary Medical ReviewerE. Gregory Thompson, MD - Internal MedicineBrian O'Brien, MD, FRCPC - Internal MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerPeter Shalit, MD, PhD - Internal Medicine, Infectious Disease
Current as ofNovember 18, 2017
Current as of: November 18, 2017
E. Gregory Thompson, MD - Internal Medicine
& Brian O'Brien, MD, FRCPC - Internal Medicine & Adam Husney, MD - Family Medicine & Peter Shalit, MD, PhD - Internal Medicine, Infectious Disease
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