A total of 84 HIV-infected homosexual men having either normal oral mucosa (NOM), erythematous candidiasis (EC) or pseudomembranous candidiasis (PsC) were included in the study. The patients were evaluated by median number of peripheral CD4+ cells, CD8+ cells and by lymphocyte function assessed by poke-weed mitogen test. There was a significant difference between CD4+ counts among patients with the two subtypes of candidiasis (95% CI of median difference: 10-240/mm3; P = 0.03), but not for pokeweed mitogen response. Survival analysis showed that after 2 y there was no significant difference in development of AIDS between patients with EC and PsC (P = 0.29). If patients with both types of oral candidiasis were pooled and compared with patients with NOM, a significant difference in development of AIDS was found (P = 0.04). It is concluded that HIV-infected patients with oral candidiasis of any subtype (EC or PsC) are significantly more immune suppressed and show a faster development of AIDS than HIV-infected patients with NOM. However, in this cohort, EC and PsC are of equal importance as predictors for immune suppression and AIDS development.