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Published on: May 29, 2012
Separation of spring viraemia of carp virus from large-volume samples using immunomagnetic beads
Jing Hongli1, Zhang Min1, Gao Longying2
1Chinese Academy of Inspection and Quarantine, Beijing, 100176, China.
Insights
A new immunomagnetic bead (IMB) method enhances the detection of Spring Viraemia of Carp Virus (SVCV). This technique significantly improves viral RNA concentration and detection limits in large water samples for better fish disease surveillance.
Area of Science:
- Aquatic Animal Health
- Virology
- Biotechnology
Background:
- Spring Viraemia of Carp Virus (SVCV) is a significant pathogen affecting carp populations.
- Accurate and sensitive detection of SVCV in large water volumes is crucial for disease control.
- Current detection methods may lack sensitivity for early-stage or low-concentration infections.
Purpose of the Study:
- To develop and optimize an immunomagnetic bead (IMB) based method for SVCV separation.
- To evaluate the efficiency of IMBs in concentrating SVCV from large-volume water samples.
- To assess the impact of IMB pre-treatment on the sensitivity of subsequent RT-qPCR detection.
Main Methods:
- Development of immunomagnetic beads coated with polyclonal antibodies against SVCV.
- Optimization of IMB concentration (2 mg per 100 mL) for SVCV capture.
- Application of IMB-based separation followed by RNA extraction and RT-qPCR analysis.
- Comparison of detection limits and viral RNA yields between IMB-treated and untreated samples.
- Validation using naturally infected fish samples to assess concordance with RT-qPCR alone.
Main Results:
- The optimized IMB method achieved a 103-fold improvement in SVCV detection limit in 100-mL samples using RT-qPCR.
- Viral RNA concentration increased by 5.18 × 103-fold after IMB separation compared to unseparated samples.
- A 100% concordance rate was observed between the IMB/RT-qPCR method and RT-qPCR alone when testing fish samples, indicating high reliability.
Conclusions:
- Immunomagnetic beads provide an effective tool for concentrating SVCV from large water volumes.
- The IMB-based method significantly enhances the sensitivity of RT-qPCR for SVCV detection.
- This approach offers a promising strategy for improved surveillance and early detection of SVCV in aquaculture and wild fish populations.
Abstract:
A method for separation of spring viraemia of carp virus (SVCV) from large-volume samples using immunomagnetic beads (IMBs) coated with a polyclonal antibody against SVCV was developed. The optimum amount of IMBs was 2 mg in 100 mL. After IMB treatment, the detection limit of SVCV in reverse transcription quantitative PCR (RT-qPCR) was 103 times the 50% tissue culture infectious dose per mL in 100-mL samples. The concentration of viral RNA extracted from SVCV that had been separated using IMBs was 5.18 × 103-fold higher than that of the unseparated SVCV. When fish samples were tested, the concordance rates of the IMBs/RT-qPCR and RT-qPCR were 100% and 67.5%, respectively.
