The PCR-HRM system developed in this study, proved to be a rapid and reliable tool using pure M. synoviae infected commercial chicken flocks were tested using obg PCR-HRM system and results were consistent with those of vlhA genotyping.
ROTOR GENE 6000 THERMAL CYCLER FREE
A set of respiratory swabs from MS-H vaccinated specific pathogen free chickens and M. Using a combination of nested-obg and obg-F3R3 PCR-HRM, 97% of the isolates/strains were typed according to their ts phenotype with all MS-H isolates typed as MS-H. The mean genotype confidence percentages, 96.9☓.4 and 8.8☑1.2 for ts + and ts – strains, respectively, demonstrated high differentiating power of the nested-obg PCR-HRM. synoviae strains/isolates but also from ts – MS-H revertants. The nested-obg PCR-HRM differentiated ts + MS-H vaccine not only from field M. In this study, four PCRs followed by high-resolution melting (HRM)-curve analysis of the regions encompassing these SNPs were developed and evaluated for their potential to differentiate MS-H from 36 M. Single nucleotide polymorphisms (SNPs) in the obg of MS-H have been found to associate with ts phenotype. synoviae strains and from rarely occurring non-temperature-sensitive ( ts –) MS-H revertants has become important, especially in countries where local strains are indistinguishable from MS-H by sequence analysis of variable lipoprotein haemagglutinin ( vlhA) gene. synoviae infections, differentiation of MS-H from field M. With increasing use of this vaccine to control M. synoviae vaccine commercially available for use in poultry.
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Temperature-sensitive ( ts +) vaccine strain MS-H is the only live attenuated M.