Rapid diagnosis of infectious laryngotracheitis using a monoclonal antibody-based immunoperoxidase procedure

Area of Science:

• Veterinary Pathology
• Virology
• Immunodiagnostics

Background:

• Infectious laryngotracheitis (ILT) is a significant respiratory disease in poultry.
• Accurate and sensitive diagnostic methods are crucial for controlling ILT outbreaks.
• Current diagnostic techniques for ILT virus have limitations in sensitivity or specificity.

Purpose of the Study:

• To develop and evaluate an indirect immunoperoxidase (IP) procedure for detecting infectious laryngotracheitis (ILT) virus antigen.
• To compare the diagnostic performance of the IP procedure against established methods for ILT diagnosis.

Main Methods:

• Development of an indirect immunoperoxidase (IP) test utilizing monoclonal antibodies.
• Application of the IP test on frozen tissue sections from experimentally infected chickens.
• Comparative analysis with indirect immunofluorescent antibody (FA) tests, histopathology, and virus isolation.

Main Results:

• The IP procedure demonstrated a sensitivity of 72% and a specificity of 93% when compared to virus isolation.
• The indirect immunofluorescent antibody (FA) procedure showed lower sensitivity (53%) and specificity (90%).
• Histopathology exhibited high specificity (98%) but poor sensitivity (42%) for ILT virus detection.

Conclusions:

• The indirect immunoperoxidase (IP) procedure is a potentially useful diagnostic tool for infectious laryngotracheitis (ILT).
• The IP test offers a favorable balance of sensitivity and specificity for ILT diagnosis in poultry.
• This method could aid in the timely and accurate diagnosis of ILT virus infections.