Comparison of methods for isolation of mycobacteria from water.

Applied and Environmental Microbiology
M NeumannK Behringer

Abstract

Twelve methods for the isolation of mycobacteria were compared by applying them in parallel to 26 samples of surface water and 109 samples of treated water. Each method was defined by a particular combination of decontamination method, growth medium, and incubation temperature. For the decontamination of surface water, we used cetylpyridinium chloride (CPC) (30 min, 0.05%), as well as sample preincubation in tryptic soy broth (TSB) followed by decontamination with a cocktail of NaOH, cycloheximide, and malachite green. Treated water was decontaminated with 0.005 and 0.05% CPC (30 min). After enrichment by filtration, all samples were incubated on Lowenstein-Jensen medium (LJ), Ogawa egg yolk medium (OEY), and Ogawa whole-egg medium containing ofloxacin and ethambutol (OEOE) at temperatures of 30 and 37(deg)C. The efficacy of each method was determined by calculating the positivity rate, negativity rate, contamination rate, mean number of mycobacterial colonies grown, and mean number of different mycobacterial strains isolated. The last value was determined by subjecting the isolates to PCR restriction analysis and mycolic acid thin-layer chromatography. Statistical analysis demonstrated that both the TSB method and 0.05% CPC we...Continue Reading

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Citations

Feb 28, 2004·Expert Reviews in Molecular Medicine·Melanie Newport
Apr 7, 2010·Applied and Environmental Microbiology·Nicolas RadomskiFrançoise S Lucas
Mar 21, 2013·APMIS : Acta Pathologica, Microbiologica, Et Immunologica Scandinavica·Gonca Erkose GencZayre Erturan
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