Related Experiment Video
Updated: Aug 9, 2026
14:04
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
[A chromogenic method for rapid identification of Staphylococcus aureus]
S Langlet1, G Quentin, G Contant
1Service de microbiologie, Centre hospitalier de Versailles, 177, rue de Versailles, 78157 Le Chesnay.
Annales De Biologie Clinique
|April 22, 1999
Summary
A new 2-hour method rapidly identifies Staphylococcus aureus using a chromogenic substrate, crucial for combating serious infections. This rapid detection aids clinical microbiology by providing quick results for S. aureus.
Area of Science:
- Clinical Microbiology
- Biochemistry
Background:
- Staphylococcus aureus causes severe infections, including septicaemia and nosocomial infections.
- Rapid and accurate identification of S. aureus is critical in clinical settings.
- Current identification methods require 18-24 hours for incubation.
Purpose of the Study:
- To develop and evaluate a rapid, 2-hour identification method for Staphylococcus aureus.
- To assess the efficacy of a chromogenic substrate assay utilizing human prothrombin for S. aureus detection.
Main Methods:
- A novel method was developed using human prothrombin and a chromogenic substrate (SQ149) for S. aureus detection.
- 242 staphylococcal strains (160 S. aureus, 82 coagulase-negative staphylococci) were tested.
- Results were compared to reference methods: plasma clotting, biochemical tests, and agglutination tests.
Main Results:
- The chromogenic method achieved 99.4% sensitivity and 100% specificity.
- All S. aureus strains tested positive within 1-2 hours.
- Methicillin-resistant S. aureus (MRSA) detection reached 98.4% after 2 hours, with no false positives from coagulase-negative staphylococci.
Conclusions:
- The 2-hour chromogenic method provides a rapid, specific, and sensitive alternative for S. aureus identification.
- This method simplifies clinical microbiology workflows by eliminating the need for complementary tests.
- The assay demonstrates excellent precision and is suitable for routine use in clinical laboratories.
More Related Videos
13:29Rapid Identification of Gram Negative Bacteria from Blood Culture Broth Using MALDI-TOF Mass Spectrometry
Published on: May 28, 2014
09:07Direct Microbial Identification using An Automated Microbial Identification System to Facilitate the EUCAST RAST Method Without Mass Spectrometry
Published on: May 24, 2024
Related Concept Videos
01:03Fixation and Sectioning
Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...
01:26Differential Staining Technique
Differential staining is an essential microbiological technique that exploits variations in cell wall structures to classify and identify microorganisms. It facilitates the distinction of bacteria, aiding in diagnostic and research applications. Two of the most widely used differential staining methods are Gram staining and acid-fast staining, both of which rely on the chemical and structural differences in bacterial cell walls.Gram Staining TechniqueGram staining differentiates bacteria by...
01:13Special Staining Techniques
Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
01:25Rapid Identification of Pathogens
MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...
01:24Automated Microbial Diagnostics
Automated diagnostic analyzers have transformed clinical microbiology by providing rapid and reliable methods for pathogen identification and antibiotic susceptibility testing. Among these systems, the Vitek 2 is widely used because it automates the traditionally labor-intensive processes of microbial identification (ID) and antibiotic susceptibility testing (AST), delivering standardized and timely results that are essential for effective patient care.Microbial Identification with ID CardsThe...