20.4.2  Clinical staging of HIV disease and AIDS

As time passes and the number of CD4 lymphocytes declines even further, to a very low level, the incidence of opportunistic infections and other health problems in PLHIV increase, and the person is said to have reached a particular stage of HIV disease. The final stage of this progressive deterioration is known as AIDS — Acquired Immunodeficiency Syndrome — based on diagnostic criteria developed by the World Health Organization (WHO).

WHO HIV clinical staging is described in Study Session 21.

20.4.1  The natural course of HIV infection

20.5  Modes of transmission of HIV