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- W2000441534 abstract "An efficacious bovine herpesvirus type-1 (BHV-1) vaccine has been used for many years. However, in the past few years, abortion and respiratory diseases have occurred after administration of the modified live vaccine. To investigate whether BHV-1 isolates from disease outbreaks are identical to those of the vaccines used, selected regions of the BHV-1 genome were investigated by high-resolution melting (HRM) analysis and PCR-DNA sequencing. When a target region within the thymidine kinase (TK) gene was examined by HRM analysis, 6 out of the 11 isolates from abortion cases and 22 out of the 25 isolates from bovine respiratory disease (BRD) cases had different melting curves compared to the vaccine virus. Surprisingly, when a conserved region within the US6 gene that encodes glycoprotein D (gD) was examined by HRM analysis, 5 out of the 11 abortion isolates and 18 out of the 23 BRD isolates had different melting curves from the vaccine virus. To determine whether SNPs within the coding regions of glycoprotein E (gE) and TK genes can be used to differentiate the isolates from the vaccine virus, PCR-DNA sequencing was used to examine these SNPs in all the isolates. This revealed that only 1 out of 11 of the abortion isolates and 4 out of 24 of the BRD isolates are different in the target region of gE from the vaccine virus, while 5 out of 11 abortion isolates and 4 out of 22 BRD isolates are different in the target region of TK from the vaccine virus. No DNA sequence differences were observed in glycoprotein G (gG) region between disease and vaccine isolates. Our study demonstrated that many disease isolates had genetic differences from the vaccine virus in regions examined by HRM and PCR-DNA sequencing analysis. In addition, many isolates contained more than one type of mutation and were composed of mixed variants. Our study suggests that a mixture of variants were present in isolates collected post-vaccination. HRM is a rapid diagnostic method that can be used for rapid differentiation of clinical isolates from vaccine strains." @default.
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- W2000441534 date "2015-02-01" @default.
- W2000441534 modified "2023-10-17" @default.
- W2000441534 title "Differentiation of BHV-1 isolates from vaccine virus by high-resolution melting analysis" @default.
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- W2000441534 doi "https://doi.org/10.1016/j.virusres.2014.12.012" @default.
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