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Specific detection of avian pneumovirus (APV) US isolates by RT-PCR
H J Shin1, G Rajashekara, F F Jirjis
1Department of Veterinary PathoBiology, University of Minnesota, St. Paul, USA.
Abstract:
This report details the development of an RT-PCR assay for the specific detection of US isolates of avian pneumovirus (APV). Of the several primer pairs tested, two sets of primers derived from the matrix gene of APV were able to specifically detect the viral RNA of APV. The nucleotide sequence comparison of the PCR products of APV isolates from Minnesota suggested that these viruses were closely related to the Colorado strain of APV, but were distinct from subtypes A and B European isolates of turkey APV (turkey rhinotracheitis: TRT). This M gene-based PCR was found to be very specific and sensitive. APV as low as 8 x 10(-5) TCID50 (0.0323 microg/ml) could be detected using this assay. In addition, the two primers were able to differentiate isolates from turkeys in Minnesota.
Insights
A new RT-PCR assay was developed to detect avian pneumovirus (APV) in US isolates. This sensitive and specific assay, targeting the M gene, can differentiate between APV strains.
Area of Science:
- Veterinary Virology
- Molecular Diagnostics
- Avian Pathology
Background:
- Avian pneumovirus (APV) causes significant respiratory disease in poultry.
- Accurate detection and strain differentiation are crucial for disease control.
- Existing diagnostic methods may lack specificity or sensitivity for certain APV strains.
Purpose of the Study:
- To develop and validate a reverse transcription-polymerase chain reaction (RT-PCR) assay for the specific detection of US avian pneumovirus (APV) isolates.
- To characterize the genetic relationship of US APV isolates.
- To assess the sensitivity and specificity of the developed assay.
Main Methods:
- Screening of multiple primer pairs targeting the APV matrix (M) gene.
- Nucleotide sequence comparison of PCR products from US APV isolates.
- Determination of assay sensitivity using serial dilutions (TCID50).
Main Results:
- Two primer sets targeting the APV M gene demonstrated high specificity and sensitivity for detecting viral RNA.
- Sequence analysis indicated US APV isolates are closely related to the Colorado strain and distinct from European subtypes A and B.
- The assay detected APV at levels as low as 8 x 10(-5) TCID50.
- The primers successfully differentiated APV isolates from turkeys in Minnesota.
Conclusions:
- A highly specific and sensitive RT-PCR assay targeting the APV M gene has been successfully developed.
- This assay is effective for detecting and differentiating US APV isolates.
- The findings contribute to better understanding and control of APV in poultry populations.