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Detection of Flexibacter maritimus in fish tissue using nested PCR amplification
C Cepeda1, S García-Márquez, Y Santos
1Departamento de Microbiología y Parasitología, Facultad de Biologá, Universidad de Santiago de Compostela, Spain. mpcatuxa@usc.es
Journal of Fish Diseases
|September 10, 2003
Summary
A rapid nested polymerase chain reaction (PCR) method accurately detects Flexibacter maritimus in fish tissue. This sensitive assay significantly speeds up diagnosis of marine flexibacteriosis, aiding fish health management.
Area of Science:
- Veterinary Microbiology
- Aquatic Animal Health
- Molecular Diagnostics
Background:
- Marine flexibacteriosis, caused by Flexibacter maritimus, is a significant disease affecting fish populations.
- Accurate and rapid diagnostic methods are crucial for managing and controlling this economically important fish pathogen.
- Existing diagnostic techniques may be time-consuming or lack the required sensitivity for early detection.
Purpose of the Study:
- To develop and validate a highly sensitive and rapid nested polymerase chain reaction (PCR) assay for the detection of Flexibacter maritimus in fish tissues.
- To optimize the diagnostic procedure for a total turnaround time of less than 4 hours, from DNA extraction to results.
- To confirm the assay's accuracy and efficiency under field conditions for routine diagnostic applications.
Main Methods:
- Development of a nested PCR system specifically targeting Flexibacter maritimus DNA.
- Integration of a rapid DNA extraction protocol with a shortened thermal cycling program.
- Validation of the assay using fish tissue samples collected from diseased fish over a 10-year period (1993-2002).
Main Results:
- The nested PCR assay demonstrated high sensitivity, detecting as few as 75 colony-forming units (cfu) per milligram of fish tissue.
- The entire diagnostic procedure, including DNA extraction and electrophoretic analysis, was completed in under 4 hours.
- Field validation confirmed the accuracy and reliability of the nested PCR method for detecting F. maritimus in naturally infected fish.
Conclusions:
- The developed nested PCR system provides a rapid, sensitive, and accurate method for diagnosing marine flexibacteriosis caused by Flexibacter maritimus.
- This assay is suitable for routine diagnostic use, enabling faster disease management and contributing to improved fish health.
- The optimized protocol significantly reduces the time required for pathogen detection, facilitating timely intervention in aquaculture and wild fisheries.