1993 REVISED CLASSIFICATION-SYSTEM FOR HIV-INFECTION AND EXPANDED SURVEILLANCE CASE-DEFINITION FOR AIDS AMONG ADOLESCENTS AND ADULTS (REPRINTED FROM MMWR, VOL 41, PG RR 17, 1992)

CDC has revised the classification system for HIV infection to emphasi ze the clinical importance of the CD4+ T-lymphocyte count in the categ orization of HIV-related clinical conditions. This classification syst em replaces the system published by CDC in 1986 [1] and is primarily i ntended for use in public health practice. Consistent with the 1993 re vised classification system, CDC has also expanded the AIDS surveillan ce case definition to include all HIV-infected persons who have <200 C D4+ T-lymphocytes/muL, or a CD4+ T-lymphocyte percentage of total lymp hocytes of < 14. This expansion includes the addition of three clinica l conditions-pulmonary tuberculosis, recurrent pneumonia, and invasive cervical cancer-and retains the 23 clinical conditions in the AIDS su rveillance case definition published in 1987 [2]; it is to be used by all states for AIDS case reporting effective January 1, 1993.