Abstract:
:Rapid detection of drug-resistant bacteria in clinical samples plays an instrumental role in patients' infection management and in implementing effective infection control policies. In the study described in this report, we validated a multiplex TaqMan real-time quantitative PCR (qPCR) assay for the detection of bla(KPC) genes and the human RNase P gene in Bactec blood culture bottles. The MagNA Pure LC (version 2.0) instrument was utilized to extract nucleic acids from the inoculated broth, while bovine serum albumin (BSA) was utilized as the PCR inhibitor reliever. The multiplex assay, which was specific for the detection of bla(KPC) genes, had a limit of detection of 19 CFU per reaction mixture with human blood-spiked Bactec bottles. Of the 323 Bactec blood culture sets evaluated, the same 55 (17%) blood cultures positive for carbapenem-resistant bacteria by culture were also positive by the validated qPCR assay. Thus, the sensitivity, specificity, positive predictive value, and negative predictive value of the qPCR assay compared to the results of culture were all 100%. bla(KPC) genes were also detected from the same Bactec bottle broth after manual extraction with a QIAamp DNA minikit; however, there was an average 3-threshold-cycle delay in the qPCR readings. With the limited therapeutic options available, the accurate and rapid detection of bla(KPC)-possessing bacteria by the described bla(KPC)/RNase P assay will be a crucial first step in ensuring optimal clinical outcomes and infection control.
journal_name
J Clin Microbioljournal_title
Journal of clinical microbiologyauthors
Hindiyeh M,Smollan G,Grossman Z,Ram D,Robinov J,Belausov N,Ben-David D,Tal I,Davidson Y,Shamiss A,Mendelson E,Keller Ndoi
10.1128/JCM.00149-11subject
Has Abstractpub_date
2011-07-01 00:00:00pages
2480-4issue
7eissn
0095-1137issn
1098-660Xpii
JCM.00149-11journal_volume
49pub_type
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