Efficacy of Chemical Dosing Methods for Isolating Nontuberculous Mycobacteria from Water Supplies of Dialysis Centers

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 1988 Jul 1

PMID 3415237

Citations 16

Authors

L A Carson

L B Cusick

L A Bland

M S Favero

Affiliations

Soon will be listed here.

Abstract

Investigations of nontuberculous mycobacterium (NTM) infections associated with various environmental sources have been hampered by the lack of adequate techniques for selective isolation of these organisms from environmental fluids. This study compared chemical dosing techniques for recovery of NTM from water samples collected from 115 randomly selected dialysis centers. Cell suspensions of NTM group II and IV isolates and gram-negative bacteria were exposed to solutions containing sodium hypochlorite (0.2 micrograms/ml of free available chlorine), formaldehyde (1, 0.75, or 0.5%), oxalic acid (1.25%), cetylpyridinium chloride (25 micrograms/ml), or cetyltrimethylammonium bromide (100 micrograms/ml). Results of standard membrane filtration assays with laboratory test strains and water samples from dialysis centers showed that 5 min of exposure to 1% formaldehyde effectively reduced gram-negative bacterial populations and allowed increased recovery of NTM in environmental fluids containing mixed microbial populations.

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