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Updated: Aug 29, 2025
Rapid Diagnosis of Avian Influenza Virus in Wild Birds: Use of a Portable rRT-PCR and Freeze-dried Reagents in the Field
Published on: August 2, 2011
New rapid detection by using a constant temperature method for avian leukosis viruses
Xiuhong Wu1,2,3, Fengsheng Chu1,2,3, Luxuan Zhang4
1Heyuan Branch, Guangdong Provincial Laboratory of Lingnan Modern Agricultural Science and Technology and Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular Breeding, College of Animal Science, South China Agricultural University, Guangzhou, China.
A new real-time reverse transcription recombinase-aided amplification (RT-RAA) assay offers rapid, accurate detection of avian leukemia virus (ALV). This method provides a valuable tool for controlling ALV, a costly poultry disease, with high specificity and sensitivity.
Area of Science:
- Veterinary Virology
- Molecular Diagnostics
- Poultry Health
Background:
- Avian leukemia virus (ALV) causes significant immunosuppression and economic losses in the poultry industry worldwide.
- Existing challenges in ALV control include viral genetic diversity, complex transmission, and lack of effective vaccines or therapeutics.
- Accurate and rapid diagnostic methods are crucial for ALV prevention and management.
Purpose of the Study:
- To develop and validate a novel, rapid, and sensitive diagnostic assay for avian leukemia virus (ALV).
- To establish a cost-effective and user-friendly method for ALV detection in clinical settings.
Main Methods:
- Design of real-time reverse transcription recombinase-aided amplification (RT-RAA) primers and probe targeting the ALV P12 gene.
- Optimization of the RT-RAA assay for rapid amplification at 39°C within 5-30 minutes.
- Validation of the assay's specificity against common avian pathogens and sensitivity using clinical samples compared to RT-PCR.
Main Results:
- The developed real-time RT-RAA assay demonstrated high sensitivity, detecting as low as 10 copies of ALV RNA.
- The assay showed no cross-reactivity with a panel of other significant avian viruses.
- Comparison with RT-PCR on 44 clinical samples yielded a kappa value of 0.91, indicating excellent agreement.
- Assay reproducibility was confirmed with coefficients of variation within 5.18% across different concentration gradients.
Conclusions:
- The real-time RT-RAA assay is a highly specific, sensitive, rapid, and cost-effective method for avian leukemia virus (ALV) detection.
- This assay represents a valuable advancement for the diagnosis and control of ALV in poultry.
- The assay's simplicity and speed make it suitable for field applications in avian disease management.
