Table 7.

Clinical Staging of HIV Infection (39)^a

HIV STAGE	DEFINITION
1	No immunosuppression (based on CD4 values) and no history of AIDS-defining illness
2	Moderate immunosuppression (based on CD4 values) and no history of AIDS-defining illness
3	Severe immunosuppression (based on CD4 values) or history of AIDS-defining illness

HIV=human immunodeficiency virus.

^aUntil 2014, CD4-based immunosuppression (none, moderate, severe) was categorized separately from a clinical staging in children (<13 years old): N, no signs or symptoms; A, mild signs or symptoms; B, moderate signs or symptoms; C, severe, AIDS-defining illness.(40)