Diagnosis of systemic or visceral candidosis.

Although systemic or visceral candidosis can be diagnosed during life, it is usually discovered at autopsy. Early diagnosis is important since treatment with specific antifungal drugs is effective. The diagnosis should rest on all available clinical and laboratory evidence. Mucocutaneous lesions and chorioretinitis are important clinical findings in the presence of predisposing illness and iatrogenic factors. Repeatedly positive blood cultures for Candida in the absence of an indwelling intravenous line and Candida colony counts of 10 000/ml or greater in urine freshly obtained by catheter in the absence of an indwelling Foley catheter are very significant. Similarly significant is recovery of Candida from closed spaces (pleural, peritoneal, joint or subarachnoid). The agar gel diffusion test for Candida antibodies has a sensitivity and specificity of 85% or greater and can confirm the diagnosis in otherwise doubtful cases. The various antibody tests for Candida are not suitable for random screening because of the low prevalence of visceral or systemic candidosis in the general population.