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Journal of Clinical Microbiology, 10 1997, 2706-2708, Vol 35, No. 10
S Whittier, K Olivier, P Gilligan, M Knowles and P Della-Latta
An improved decontamination method has been demonstrated to reduce
overgrowth of mycobacterial media by Pseudomonas aeruginosa and allow the
successful recovery of nontuberculous mycobacteria (NTM) from cystic
fibrosis (CF) patients. Twenty microbiology laboratories participating in a
multicenter investigation designed to determine the significance of NTM in
CF patients were required to demonstrate proficiency in the incorporation
of this improved method; this was accomplished by successful
decontamination and culture workup of a panel of simulated sputum samples
seeded with P. aeruginosa and various NTM. All laboratories successfully
recovered NTM from samples with acid- fast bacillus (AFB) smear scores of
3+/4+ (i.e., 2 to 18 or > 18 organisms/field). Low-inoculum samples
(1+/2+ AFB smears [2 to 18 organisms in 100 or 10 fields]) were problematic
in that processed specimens were often smear and/or culture negative.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Proficiency testing of clinical microbiology laboratories using modified decontamination procedures for detection of nontuberculous mycobacteria in sputum samples from cystic fibrosis patients. The Nontuberculous Mycobacteria in Cystic Fibrosis Study Group
Columbia-Presbyterian Medical Center, and Department of Pathology, College of Physicians & Surgeons, New York, New York 10032, USA.
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