Positive first round ORF24 and ORF25 PCR products were purified with a DNA Gel Extraction Kit (Dongsheng Biotech,Guangzhou, China) and inserted in a pGEM-T vector (Promega).
After sequencing verification (Shanghai Majorbio Bio-Pharm Technology,Shanghai, China) and quantification by Nanodrop 2000 spectrophotometer, the reconstruction vector was used as a standard reference for sensitivity assay. A 10-fold serial water dilution of positive vector was used as a template for the nested PCR assay described in Section 2.4. The dilution gradients of ORF24 were from 5.6 × 108 to 0.56 virus copies, and gradients of ORF25 were from 1.1 × 109 to 1.1 virus copies.
Positive first round ORF24 and ORF25 PCR products were purified with a DNA Gel Extraction Kit (Dongsheng Biotech,Guangzhou, China) and inserted in a pGEM-T vector (Promega).After sequencing verification (Shanghai Majorbio Bio-Pharm Technology,Shanghai, China) and quantification by Nanodrop 2000 spectrophotometer, the reconstruction vector was used as a standard reference for sensitivity assay. A 10-fold serial water dilution of positive vector was used as a template for the nested PCR assay described in Section 2.4. The dilution gradients of ORF24 were from 5.6 × 108 to 0.56 virus copies, and gradients of ORF25 were from 1.1 × 109 to 1.1 virus copies.
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