Effect of methodology, dilution, and exposure time on the tuberculocidal activity of glutaraldehyde-based disinfectants.

Abstract:

:The Association of Official Analytical Chemists (AOAC) test for assessing the tuberculocidal activity of disinfectants has been shown to be variable. A modified AOAC test, which substituted Middlebrook 7H9 broth as the primary subculture medium and used neutralization by dilution, was compared with the standard AOAC method to assess the mycobactericidal activity of three glutaraldehyde-based disinfectants at 20 degrees C and various exposure times. These changes had a marked effect on results, with the modified AOAC test providing more positive penicylinders per 10 replicates in 12 of the 13 comparisons that provided positive results. These differences were observed with both Mycobacterium bovis (ATCC 35743) and a clinical isolate of Mycobacterium tuberculosis. The effects of various exposure times to and dilutions of the glutaraldehyde-based disinfectants were also examined. The minimum exposure time needed to inactivate reliably M. bovis or M. tuberculosis with 2% glutaraldehyde was 20 min at 20 degrees C. Diluting 2% glutaraldehyde caused a significant decline in mycobactericidal activity. Modification of the standard AOAC test to improve its sensitivity in detecting the failure of disinfectants to inactivate mycobacteria is indicated.

journal_name

Appl Environ Microbiol

authors

Cole EC,Rutala WA,Nessen L,Wannamaker NS,Weber DJ

doi

10.1128/AEM.56.6.1813-1817.1990

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

1813-7

issue

6

eissn

0099-2240

issn

1098-5336

journal_volume

56

pub_type

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