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The proper management of candidemic patients is controversial because of the difficulties of an early differentiation of central venous catheter (CVC)-related candidemia from deep-seated invasive Candida infection. In particular, more information on possible markers of invasive disease is needed. We performed a retrospective, pilot investigation to assess the diagnostic potential of a dot immunobinding assay for Candida mannoprotein antigen in serial serum samples from 31 candidemic patients in the setting of hematologic malignancy. Mannoproteinemia (antigenemia) was detected in 1 of 14 (7.1%) patients with transient or CVC-related candidemia and in 13 of 17 (76.5%) patients with non-CVC-related persistent candidemia. Of the 11 subjects of this latter group with documented tissue invasion, 10 (91%) were antigenemic. The patients belonging to the different categories did not significantly differ in the duration of candidemia, nor was there any significant difference among the different groups of subjects either in the number of serum samples examined or in their collection time during candidemia. The day of the first antigenemic sample during candidemia greatly varied among subjects with invasive infection, although on average mannoproteinemia was detectable by the first week of candidemia. In summary, our data demonstrate a correlation between mannoproteinemia and tissue invasion by Candida spp. in candidemic patients and suggest that mannoprotein detection by our method has a potential for the diagnosis of invasive candidiasis in these subjects.

Assessment of detection of Candida mannoproteinemia as a method to differentiate central venous catheter-related candidemia from invasive disease