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Outline
This study aimed to establish a cost-effective duplex TaqMan real-time quantitative PCR （qPCR） assay for the rapid detection of Brucella infection in animals and animal products， and to differentiate B.abortus from other Brucella species. This method provides a scientifically valid diagnostic tool for distinguishing currently used vaccine strains and novel vaccines under development. Specific primers and TaqMan probes targeting the galU and Omp31 genes were designed based on GenBank sequences. Recombinant plasmids were constructed. The assay's specificity， sensitivity， and repeatability were rigorously evaluated. Clinical serum and tissue samples from animals with brucellosis were tested. A duplex TaqMan qPCR assay for Brucella detection was successfully developed. The limit of detection （LOD） for recombinant plasmid standards was 1.93×100copies·μL-1. The assay exhibited no cross-reactivity with other Gram-negative bacteria. Both intra-assay and inter-assay reproducibility were excellent， with coefficients of variation （CV） consistently below 2%. Testing of 156 samples （including laboratory-prepared and clinical specimens） revealed a positive agreement rate of 69.75% compared to BCSP31-PCR. Furthermore， the duplex TaqMan qPCR demonstrated significantly higher sensitivity （100%） than conventional PCR （69.75%） and the RBPT （58.65%）. The established duplex TaqMan qPCR assay provides a robust technical foundation for the clinical differential diagnosis， epidemiological surveillance， and eradication programs of brucellosis.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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