[The definition of acquired immunodeficiency syndrome (AIDS)].

The new, revised CDC case definition of AIDS (1) specifies precisely, which laboratory results and which diseases may indicate HIV-infection. The indicator diseases are divided into those with HIV-positive and HIV-not positive laboratory findings. The latter group is subdivided into diseases diagnosed definitely and diagnosed presumptively. Appendices contain directions for the interpretation of results of laboratory examinations indicating, under which circumstances the diagnosis of AIDS can be excluded or can definitely be established or which findings must be considered inconclusive. Further, the methods are listed, which have to be employed in order to provide a definitive diagnosis of an indicator disease and under which conditions a presumptive diagnosis of a disease, indicative of AIDS, is admitted.