Performance of GenoType
® MTBDRplus assay in the diagnosis of drug-resistant tuberculosis in Tangier, Morocco.
J Glob Antimicrob Resist 2017;
12:63-67. [PMID:
28899805 DOI:
10.1016/j.jgar.2017.09.002]
[Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 08/28/2017] [Accepted: 09/02/2017] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES
In Morocco, tuberculosis (TB) is a major public health problem with high morbidity and mortality. The main problem faced by the national TB programme is the high rate of drug-resistant (DR), particularly multi-drug resistant (MDR) strains. Diagnosis of DR-TB is mainly performed by conventional techniques that are time consuming with limited efficacy. In 2014, the GenoType® MTBDRplus assay was introduced in Morocco for drug susceptibility testing (DST). In this regard, the present study was planned to assess the diagnostic accuracy of the GenoType® MTBDRplus assay.
METHODS
A total of 70 samples from suspected TB cases in Tangier (Morocco) were analysed by conventional DST and GenoType® MTBDRplus assay.
RESULTS
Among the 70 samples, 37.1% were MDR, whereas monoresistance to isoniazid (INH) and rifampicin (RIF) was detected in 186% and 17.1% of strains, respectively, by DST. Using the GenoType® MTBDRplus approach, 12 isolates (17.1%) were identified as INH monoresistant, 9 (12.9%) as RIF monoresistant and 26 (37.1%) as MDR. rpoB531 and katG315 mutations were the most common mutations associated with resistance to RIF and INH, respectively. Significantly, all phenotypically MDR strains were also MDR by GenoType® MTBDRplus. The sensitivity of GenoType® MTBDRplus was 92.1% for RIF resistance and 97.4% for INH resistance, whereas the specificity was 100% for the two tested drugs.
CONCLUSIONS
GenoType® MTBDRplus assay is a rapid, reliable and accurate tool for the detection of DR-TB in clinical specimens. Its routine use will be of a great interest to prevent the dissemination of DR-TB in the community.
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