Abstract
Background: Acinetobacter baumannii is a health burden responsible for various nosocomial infections, and bacteremia in particular. The resistance of A. baumannii to most antibiotics including carbapenem has increased. OXA-23-producing A. baumannii is the chief source of nosocomial outbreaks with carbapenem-resistant A. baumannii. Successful antibiotic treatment relies on the accurate and rapid identification of infectious agents and drug resistance. Here, we describe a multiplex loop-mediated isothermal amplification (LAMP) assay for simultaneous and homogeneous identification for A. baumannii infection screening and drug-resistance gene detection. Methods: Four primer pairs were designed to amplify fragments of the recA gene of A. baumannii and the oxa-23 gene. The reaction with a 25 μl of final volume was performed at 63°C for 60 min. For comparative purposes, we used a traditional method of bacterial identification to evaluate assay efficacy. Results: The multiplex LAMP assay enables simultaneous and homogeneous detection of the recA gene of A. baumannii and the oxa-23 gene and requires less than 21 min with no pre-requisite for DNA purification prior to the amplification reaction. The detection is specific to A. baumannii, and the coincidence rate of the multiplex LAMP and the traditional method was 100%. Conclusions: Our data indicate that the multiplex LAMP assay is a rapid, sensitive, simultaneous and homogeneous method for screening of A. baumannii and its drug-resistance gene.
Highlights
Acinetobacter baumannii, an opportunistic pathogen, is a health burden responsible for various nosocomial infections, and bacteremia in particular [1,2,3]
We describe the development of a multiplex loop-mediated isothermal amplification (LAMP) assay for simultaneous and homogeneous identification for A. baumannii infection screening and drug-resistance gene detection
We developed a specific multiplex LAMP assay for measuring A. baumannii and carbapenem-resistance
Summary
Acinetobacter baumannii, an opportunistic pathogen, is a health burden responsible for various nosocomial infections, and bacteremia in particular [1,2,3]. Acinetobacter baumannii is a health burden responsible for various nosocomial infections, and bacteremia in particular. OXA-23-producing A. baumannii is the chief source of nosocomial outbreaks with carbapenem-resistant A. baumannii. Successful antibiotic treatment relies on the accurate and rapid identification of infectious agents and drug resistance. We describe a multiplex loop-mediated isothermal amplification (LAMP) assay for simultaneous and homogeneous identification for A. baumannii infection screening and drug-resistance gene detection. Results: The multiplex LAMP assay enables simultaneous and homogeneous detection of the recA gene of A. baumannii and the oxa-23 gene and requires less than 21 min with no pre-requisite for DNA purification prior to the amplification reaction. Conclusions: Our data indicate that the multiplex LAMP assay is a rapid, sensitive, simultaneous and homogeneous method for screening of A. baumannii and its drug-resistance gene
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