Monroy VE, Martínez MG, Fernández AC, Illnait ZMT, García RA, Perurena LM, Díaz RR

Language: Spanish
References: 22
Page: 120-131
PDF size: 172.54 Kb.

ABSTRACT

Introduction: Histoplasma capsulatum is the causal agent of histoplasmosis. If not treated, the disseminated form of this mycosis is often fatal.
Objective: evaluate the use of peripheral blood for the molecular diagnosis of disseminated histoplasmosis and compare the results with those obtained by culture and detection of specific antibodies.
Methods: the presence of Histoplasma capsulatum DNA was determined from 12 blood samples from patients with AIDS and clinical suspicion of disseminated histoplasmosis, using two polymerase chain reaction systems (one simple and one nested, amplifying a fragment of the ITS region and the Hcp100 gene, respectively). The results were compared with those obtained by culture and serology.
Results: all 12 patients were diagnosed with disseminated histoplasmosis by simple and nested polymerase chain reaction. Culture results were positive in 6 cases (50 %), whereas the presence of anti-Histoplasma capsulatum antibodies was determined in 3 cases (25 %). The polymerase chain reaction systems used showed high sensitivity, and analytical and diagnostic specificity for detection of this clinical form of Histoplasma capsulatum.
Conclusions: results suggest that polymerase chain reaction techniques increase the reliability of histoplasmosis diagnosis when used in combination with established methods. When used for the diagnosis of disseminated histoplasmosis in AIDS patients, polymerase chain reaction systems proved to be fast, specific and sensitive.

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