Viral RNAs were extracted using QIAamp viral RNA (Qiagen) and reverse transcriptions were performed using a PrimeScript RT reagent kit with a gDNA Eraser (Takara Bio, Inc., Kusatsu, Shiga Prefecture, Japan). Viral RNA in animal samples were quantified by QuantiNova Probe RT-PCR kit (QIAGEN, Inc., Hilden, Germany) using primers targeting RNA-dependent RNA polymerase (RdRp). Taqman probe and qPCR primers were adopted from previous studies [10 (link)].
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