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CC BY-NC-ND 4.0 · J Lab Physicians 2017; 9(04): 269-272
DOI: 10.4103/JLP.JLP_154_16
Original Article

Evaluation of Nordmann, Dortet, and Poirel test for the identification of extended spectrum betalactamase production among urinary isolates of Escherichia coli

R. Deepa
Institute of Microbiology, Madras Medical College and Government General Hospital, Chennai, Tamil Nadu, India
,
Mythry Ravichandran
Institute of Microbiology, Madras Medical College and Government General Hospital, Chennai, Tamil Nadu, India
,
S. Thasneem Banu
Institute of Microbiology, Madras Medical College and Government General Hospital, Chennai, Tamil Nadu, India
,
R. Sharmila
Institute of Microbiology, Madras Medical College and Government General Hospital, Chennai, Tamil Nadu, India
› Author Affiliations Financial support and sponsorship This study was financially supported by the Indian Council of Medical Research fund for STS project.
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Abstract

CONTEXT: Current phenotypic techniques for extended spectrum beta lactamase (ESBL) detection can be interpreted after 24 h of incubation only, resulting in a delay in initiating therapy. Nordmann, Dortet, and Poirel (NDP) in 2012 proposed a novel test named ESBL NDP to overcome this limitation.

AIMS: This study aimed to evaluate the ESBL NDP test for the identification of ESBL among Escherichia coli isolates against the Clinical Laboratory Standards Institute-recommended phenotypic confirmatory method.

SETTINGS AND DESIGN: This cross-sectional study was conducted over a period of 3 months on a sample size of 100.

SUBJECTS AND METHODS: One hundred nonduplicate clinically significant E. coli urinary isolates positive by initial screening test for ESBL were subjected to the ESBL NDP test and phenotypic confirmatory test. The NDP test was evaluated by determining the sensitivity, specificity, kappa value, and confidence interval (CI) for kappa.

RESULTS: The phenotypic confirmatory test and the ESBL NDP test were positive in 82% and 63% of the isolates, respectively. ESBL NDP test had a sensitivity and specificity of 76% and 100%, positive and negative predictive values of 100% and 48%, respectively, kappa value of 0.54 (moderate agreement), and 95% CI for kappa of 0.43–0.66. The time to positivity was 1 h in 93.6% of the isolates.

CONCLUSION: The NDP test showed a good specificity, with time to positivity of 1 h. The low sensitivity could be due to the difference in the phenotypic type of ESBL producer and technical reasons.

Key words

Extended spectrum beta lactamase - Nordmann - Dortet - and Poirel test - phenotypic confirmatory test


Publication History

Received: 17 November 2016

Accepted: 19 May 2017

Article published online:
19 February 2020

© 2017.

Thieme Medical and Scientific Publishers Private Ltd.
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