Aim: To evaluate the diagnostic performance of MDI and temocillin disk (30 μg) for detection of carbapenem-resistant in comparison to real-time PCR.
Material And Methods: Fifty specimens submitted to the Microbiology Laboratory of Ain Shams University Hospitals and showed resistance to carbapenem drugs through routine culture and susceptibility testing, were assessed by both temocillin disk (30 μg) and MDI set to detect carbapenem-resistant . Results were compared to real-time PCR for detection of carbapenemase genes -48-, , and .
Results: Our work revealed that most of the CPE isolates were Klebsiella species (62%) followed by (24%), (10%) and (4%). Phenotypic detection of carbapenem-resistant classes revealed OXA - 48 in 96% of isolates, followed by MBLs (82%), and KPC (34%). All isolates were negative for . Detection of the genes by real-time PCR showed that the predominance was for the gene (96%) then (94%) followed by (54%), (46%) and finally (40%). Evaluation of the MDI set against PCR showed sensitivity (82.1%) and specificity (70%). The temocillin disk had 97.9% sensitivity and 50% specificity. The evaluation of Temocillin disk and MDI in combination for detection of carbapenem-resistant Enterobacteriaceae showed 99.7% sensitivity and 35% specificity.
Conclusion: Adding Temocillin disk to Mastdisks ID inhibitor combination set provides a simple, easy, rapid and highly sensitive test that can be used for screening and classification of carbapenem-resistant . However, it still needs confirmation by molecular techniques.
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| http://dx.doi.org/10.3889/oamjms.2018.090 | DOI Listing |
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