Molecular methods are routinely used for the differential diagnosis and genetic characterization of viral disease of livestock. Real-time, quantitative PCR (qPCR) allows RNA/DNA sequence detection and quantification and is considered the gold standard diagnostic method for most viruses. However, Sanger sequencing offers additional information and opportunity to differentiate closely related virus strains and/or serotypes, by providing the full sequence of a genetic region of interest. Therefore, to determine epizootic hemorrhagic disease virus (EHDV) serotype or identify additional genetic markers, end-point RT-PCR can be performed on EHDV-positive clinical samples, followed by Sanger sequencing and data analysis. Here we describe a detailed method for the molecular characterization of EHDV serotype using Sanger sequencing.
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