Study on simultaneous detection of four drugs resistance anti-tuberculosis front line by phage amplified biologically assay / 中华传染病杂志

ABSTRACT

Objective Evaluating possibility of phage amplified biologically(PhaB) assay in detecting susceptibility of Mycobacterium tuberculosis(MTB) to four first-anti-tuberculosis-drugs on the same time and of 139 clinical isolates to streptomycin(S), isoniazid(H), rifampin(R) and ethambatal(E) at the same time, comparing with the results of Bactec-960 and determining the minimal inhibitory concentrations(MIC) of isolates which results were not consistent. Results Concordance rates of the susceptibility to S, H, R and E in 139 clinical isolates detected by PhaB and Bactec-960 are 97.1%, 99.3%, 95.7% and 95.0% respectively. If the results of Bactec-960 system is the golden standard, the sensitivity, specificity, positive and negative predictive value (PPV and NPV) as well as accuracy of susceptibility test to S detected by PhaB assay was 90.0%, 99.1%, 96.4%, 98.2% and 97.1% respectively, to H 97.9%, 98.9%, 97.9%, 98.9% and 95.0% , to R 86.2%, 97.3%, 89.3%, 96.4% and 95.0%, to E 81.0%, 97.5%, 85.0%, 96.6% and 95.0%. There are 19 inconsistent results of 13 isolates in comparing PhaB with Bactec-960. 18 results of 12 isolates by MIC are identical with the results of PhaB assay. 1 result of 1 isolate is identical with Bactec-960. Conclusions[KG1]The results of susceptibility to S, H, R and E detected by PhaB were highly concordance rate with the results of Bactec-960. PhaB assay can be used for rapid screening of susceptibility test for MTB.