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Antimicrobial Agents and Chemotherapy, June 2004, p. 1989-1992, Vol. 48, No. 6
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.6.1989-1992.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Reactivity of Platelia Aspergillus Galactomannan Antigen with Piperacillin-Tazobactam: Clinical Implications Based on Achievable Concentrations in Serum

Nina Singh,1,2* Asia Obman,1 Shahid Husain,2 Sherrie Aspinall,1 Sue Mietzner,1 and Janet E. Stout1

Veterans Affairs Medical Center and,1 University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania2

Received 4 December 2003/ Returned for modification 20 January 2004/ Accepted 10 February 2004

The possible reactivities of commonly used antibiotics of fungal, nonfungal, and nonmicrobial or synthetic sources with the Platelia Aspergillus galactomannan assay were assessed. For drugs that tested positive, the minimal concentration of the antibiotic in serum that yielded a positive test (index, >0.5) was determined. At undiluted concentrations, piperacillin and multiple lots of piperacillin-tazobactam tested positive, whereas amoxicillin, ampicillin-sulbactam, nafcillin, cefazolin, ceftazidime, erythromycin, gentamicin, and levofloxacin tested negative. All three lots of piperacillin-tazobactam and all bags within each lot tested positive, with a mean index value of 5.168. At achievable concentrations in serum, however, only one of three lots of piperacillin-tazobactam yielded a positive test. Concentrations of 75, 150, and 300 µg/ml of serum tested positive with the Platelia Aspergillus enzyme immunoassay, whereas lower concentrations, mimicking the trough levels, tested negative. Thus, while achievable serum piperacillin-tazobactam concentrations may potentially result in a positive test for galactomannan, the timing of the collection of serum samples from patients may influence the test results, with reactivity being less likely in samples collected at trough levels or prior to the administration of a dose of the antibiotic.

* Corresponding author. Mailing address: VA Medical Center, Infectious Disease Section, University Dr. C, Pittsburgh, PA 15240. Phone: (412) 688-6179. Fax: (412) 688-6950. E-mail: nis5+{at}pitt.edu.

Antimicrobial Agents and Chemotherapy, June 2004, p. 1989-1992, Vol. 48, No. 6
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.6.1989-1992.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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