Open AccessOccurrence and Kinetics of False-Positive Aspergillus Galactomannan Test Results following Treatment with β-Lactam Antibiotics in Patients with Hematological Disorders
Author(s) -
Alban Aubry,
Raphaël Porcher,
J. Bottéro,
S. Touratier,
Thierry Leblanc,
Benoît Brethon,
Philippe Rousselot,
Emmanuel Raffoux,
Jean Menotti,
Francis Derouin,
Patricia Ribaud,
Annie Sulahian
Publication year - 2006
Publication title -
journal of clinical microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.349
H-Index - 255
eISSN - 1070-633X
pISSN - 0095-1137
DOI - 10.1128/jcm.44.2.389-394.2006
Subject(s) - galactomannan , medicine , tazobactam , antibiotics , gastroenterology , confidence interval , aspergillus , piperacillin/tazobactam , piperacillin , aspergillosis , immunology , microbiology and biotechnology , biology , pseudomonas aeruginosa , antibiotic resistance , bacteria , imipenem , genetics
Several reports have described a high rate of false-positiveAspergillus galactomannan (GM) test results for patients treated with piperacillin-tazobactam. In this retrospective study, we first examined the relationships between intravenous administration of three β-lactam antibiotics and the occurrence of false-positive GM test results in hematology patients. We then estimated the kinetics of clearance of GM after the cessation of treatment. Sequential serum samples from 69 patients that had received β-lactams were analyzed by using a PlateliaAspergillus test. A significant association was found between GM positivity (≥0.5) and the administration of β-lactams (P < 0.0001). The direct role of β-lactams in patients' serum positivity was assessed by testing 39 batches of β-lactams, of which 27 were positive for GM. None of the latter were positive according to a fungus- andAspergillus -specific PCR. The kinetics of the decrease of GM was analyzed on sequential serum samples obtained after treatment. By use of a nonlinear regression model, the average time to negative antigen was assessed to be 5.5 days (95% confidence interval [CI], 4.1 to [7.0]), with a half-life of elimination of GM of 2.4 days (95% CI, 1.8 to 3.0). This study confirms that the administration of β-lactams containing GM is responsible for false-positive diagnostic results, even up to 5 days after the cessation of treatment.