Surveillance of Aspergillus galactomannan antigenemia for invasive aspergillosis by enzyme-linked immunosorbent assay in neutropenic patients treated for hematological malignancies

The Hematology Journal : the Official Journal of the European Haematology Association
A UlusakaryaJ N Munck

Abstract

The incidence of invasive fungal infections is increasing in patients with hematological malignancies. Invasive aspergillosis is one of the most frequently encountered infections with a high mortality rate. New diagnostic tests for invasive aspergillosis such as the detection of Aspergillus galactomannan antigen by a sandwich enzyme-linked immunosorbent assay (ELISA) have recently been described. The objective of this study was to evaluate this assay as a potential surrogate for invasive procedures used to diagnose IA. We analyzed the performance of a commercially available ELISA test which we routinely use for the surveillance of galactomannan antigenemia in patients with hematological malignancies experiencing chemotherapy-induced prolonged neutropenia (ANC < 500/mm(3) for more than 7 days). Serum samples were collected on a weekly basis. Test positivity was defined in accordance with the manufacturer's recommendations. Over the 2 year study period, we analyzed 507 samples obtained during 193 neutropenic episodes from 135 patients. Ten, six and two patients were considered to have proven, probable or possible invasive aspergillosis, respectively, based on clinical, radiological or microbiological data. Forty-four positive (In...Continue Reading

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