Phases of HIV infection according to the Centers for Disease Control and Prevention

Table 10.1-1. Phases of HIV infection according to the Centers for Disease Control and Prevention
Immunologic criteria (CD4+ T-cell count)	Clinical category
Immunologic criteria (CD4+ T-cell count)	A (asymptomatic ARS or PGL)	B (symptomatic, not A or C)	C (AIDS-indicator diseases)
≥500/microL	A1	B1	C1a
200-499/microL	A2	B2	C2a
<200/microL	A3a	B3a	C3a
a AIDS is recognized in categories A3, B3, C1, C2, and C3.
Adapted from Clin Infect Dis. 2009 Sep 1;49(5):651-81.
AIDS, acquired immunodeficiency syndrome; ARS, acute retroviral syndrome; HIV, human immunodeficiency virus; PGL, persistent generalized lymphadenopathy.