Identification of Staphylococcus aureus and Determination of Methicillin Resistance Directly from Positive Blood Cultures by Isothermal Amplification and a Disposable Detection Device

Author:

Goldmeyer James1,Li Haijing2,McCormac Melinda3,Cook Steve4,Stratton Charles23,Lemieux Bertrand1,Kong Huimin1,Tang Wen1,Tang Yi-Wei23

Affiliation:

1. BioHelix Corporation, Beverly, Massachusetts 01915

2. Departments of Medicine

3. Pathology, Vanderbilt University Medical Center, Nashville, Tennessee 37232

4. Lahey Clinic Medical Center, Burlington, Massachusetts 01805

Abstract

ABSTRACT A simple, rapid, and user-friendly procedure has been developed to identify Staphylococcus aureus and determine its methicillin resistance directly from gram-positive cocci in cluster-containing blood culture medium. The specimens were diluted and heated prior to amplification of the nuc and mecA genes with isothermal helicase-dependent amplification. Amplicons were detected using a disposable detection device. The analytical sensitivity of the assays was 50 CFU per reaction, and the clinical sensitivity and specificity were both 100% for S. aureus detection and 100% and 98% for methicillin resistance determination, respectively.

Publisher

American Society for Microbiology

Subject

Microbiology (medical)

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