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Evaluation of Rapid Radiometric Method for Drug Susceptibility Testing of Mycobacterium Tuberculosis

Overview
Journal J Clin Microbiol
Specialty Microbiology
Date 1981 May 1
PMID 6787076
Citations 74
Authors
S H Siddiqi
J P Libonati
G MIDDLEBROOK
Affiliations
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Abstract

A total of 106 isolates of Mycobacterium tuberculosis were tested for drug susceptibility by the conventional 7H11 plate method and by a new rapid radiometric method using special 7H12 liquid medium with 14C-labeled substrate. Results obtained by the two methods were compared for rapidity, sensitivity, and specificity of the new test method. There was 98% overall agreement between the results obtained by the two methods. Of a total of 424 drug tests, only 8 drug results did not agree, mostly in the case of streptomycin. This new procedure was found to be rapid, with 87% of the tests results reportable within 4 days and 98% reportable within 5 days as compared to the usual 3 weeks required with the conventional indirect susceptibility test method. The results of this preliminary study indicate that the rapid radiometric method seems to have the potential for routine laboratory use and merits further investigations.

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