Abstract
Lumpy skin disease (LSD) has become the most important animal health problem in India due to high morbidity, mortality and production losses caused by it. A homologous live-attenuated LSD vaccine (Lumpi-ProVacInd) was recently developed by using a local LSD virus (LSDV) strain (LSDV/2019/India/Ranchi) in India which is likely to replace the existing practice of vaccinating cattle with goatpox vaccine. It is essential to differentiate the vaccine and field strains, if a live-attenuated vaccine has been used for control and eradication of the disease. As compared to the prevailing vaccine and field/virulent strains, the Indian vaccine strain (Lumpi-ProVacInd) has a unique deletion of 801 nucleotides in its inverted terminal repeat (ITR) region. We exploited this unique feature and developed a novel high resolution melting-based gap quantitative real-time PCR (HRM-gap-qRT-PCR) for rapid identification and quantitation of the vaccine and field strain(s) of LSDV.
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