A modified loop-mediated isothermal amplification method for detecting avian infectious laryngotracheitis virus

Area of Science:

• Veterinary Virology
• Molecular Diagnostics
• Avian Pathology

Background:

• Avian infectious laryngotracheitis (AILT) poses a significant threat to poultry health.
• Accurate and rapid diagnostic methods are crucial for controlling AILT outbreaks.

Purpose of the Study:

• To develop a highly specific and sensitive loop-mediated isothermal amplification (LAMP) assay for diagnosing AILT.
• To evaluate the efficiency, sensitivity, and specificity of the novel LAMP method.

Main Methods:

• DNA extraction from infectious laryngotracheitis virus (ILTV) strains and control samples.
• Development and optimization of a LAMP assay using specific primers.
• Evaluation of detection efficiency via turbidity and calcein methods.
• Comparison of LAMP with conventional PCR using clinical samples.

Main Results:

• The optimal temperature for the LAMP assay was determined to be 66°C.
• The LAMP assay demonstrated high specificity for ILTV.
• The minimum detection concentration for LAMP was 0.06 pg/µL, significantly more sensitive than PCR.
• Clinical sample testing confirmed the LAMP method's effectiveness in identifying AILT.

Conclusions:

• The developed LAMP assay is a highly specific and sensitive tool for AILT diagnosis.
• This method offers a rapid and effective alternative to PCR for avian disease detection.
• The assay's optimal performance at 66°C and high sensitivity make it valuable for field applications.