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Traditional clinical findings in skin presentations of candida infection include erythematous papules and nodules, ecthyma-gangrenosum-like ulcerations and verrucous plaques. Purpura fulminans and disseminated intravascular coagulation were described by Silverman et al in a patient with candida sepsis. Purpura fulminans typically is associated with precipitous development of shock, fever, and symmetrically distributed purpuric plaques that form when the skin lesions, which initially are petechiae, rapidly coalesce. In the series of patients described by Silverman et al, the biopsy of skin lesions revealed characteristic histologic changes and pseudohyphae and budding yeast cells amid the necrosis deep in the reticular dermis. When the biopsy material was cultured, it yielded Candida tropicalis, the same organism that was also identified from the blood. Silverman et al concluded that purpura fulminans can provide an early diagnostic clue in patients with candida sepsis.
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Hemorrhagic bullae have been described in patients with Candida tropicalis sepsis. In these patients, it is postulated that the release of lytic enzymes by the invading organisms caused destruction of dermal collagen with resultant bullae formation. Candida tropicalis organisms were present in numerous foci within the cavity of the bullae and around surrounding collagen fibers. In immunocompromised patients, Suster and Rosen concluded that the development of bullous skin lesions could be a sign of disseminated candidiasis. Early diagnosis is enhanced by biopsy and histological examination of lesions.
DIAGNOSIS OF CANDIDEMIA
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The growing importance of fungal species as agents of septicemia-candidemia has resulted in increased efforts to diagnose these infections accurately. Stone et al evaluated the pathogenesis and principles of treatment of Candida species and demonstrated the remarkable efficiency with which the liver cleared candida from venous blood (ratio of 10,000:1); the lungs, striated muscle, and kidneys were less effective but also filtered yeasts from the blood. This phenomenon explains why some suggest that antemortem blood cultures drawn to confirm clinical diagnosis of candidemia should be obtained from a peripheral artery or the right atrium to minimize any influence of tissue filtration. Pizzo and Walsh noted that approximately 40% to 60% of patients with proven hematogenously disseminated candidiasis have negative blood cultures. Simultaneous bacteremia and fungemia reduce the recovery of Candida species in patients with these infections.
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Currently, there are no serodiagnostic tests that are available for widespread use in diagnosing hematogenously disseminated candidiasis. The latex agglutination test is insensitive. Systems designed to detect the presence of fungal D-arainitol in sera are more sensitive than the latex agglutination test but are still under development and thus not widely available. Candidal enolase assays are fraught with false-positive and false-negative results.
The use of calcofluor white, a nonspecific fluorochrome with affinity for chitin and cellulose, to detect fungal elements in clinical specimens was first introduced by Hageague and Harrington in 1984. The use of this technique has eliminated some of the inaccuracies inherent in potassium hydroxide use and has replaced india ink and potassium hydroxide preparations for fungal detection in many clinical microbiology laboratories. Newer techniques, including DNA probes and polymerase chain reaction (PCR), are being investigated for early diagnosis of fungal infections and are important adjuncts in epidemiologic investigations.