The usefulness of blood culture in diagnosing HIV-related systemic mycoses: evaluation of a manual lysis centrifugation method

The results of 5034 blood cultures, implementing a lysis-centrifugation met hod with saponin, are summarized in this paper. Three hundred and twenty tw o blood samples (6.3%) obtained from a pool of human immunodeficiency Virus (HIV)-positive patients yielded fungi. Cryptococcus neoformans was isolate d in 199 samples (3.95%), Histoplasma capsulatum in 95 (1.89%). Candida par apsilosis in 12 (0.23%), C. albicans in 7 (0.13%), C, tropicalis in 2, C. k rusei in 1, C. guillermondii in 1, and Prototheca wickerhamii in 4 (0.07%). Blood cultures were positive for C. neoformans in 76.23% of patients havin g a diagnosis of cryptococcosis and in 89.65% of those who had histoplasmos is. The blood culture was the first means of confirming the diagnosis in 23 .8% of the patients with cryptococcosis and in 54% with histoplasmosis. In the four patients in whom P. wickerhamii was isolated, a diagnosis of disse minated protothecosis was not achieved by other findings. Catheter infectio ns were responsible for the majority of recovered Candida spp.