[Objective]To discuss the surgical treatment,the proper application,and the respective effect of the therapy of burst fracture in the posterior marginal vertebral bone block and the thoraco-lumbar vertebra.[Method]Thirty-eight patients with thoraco-lumbar burst fracture induced by high energy injury were hospitalized from July 2002 to June 2006.Through the were assessed application of section and ORIF(open reduction internal fixation),decompression of vertebral canal by bone grafting and fusion,the clinical effect of therapy by rechecking the postoperative thoracic-lumbar function and radiographic information.[Result]All the 38 patients were followed up for 12-18 months(average 14.4 months).The fracture were all healed and lumbar pain disappeared,the vertebral height restored,and well-fused.According to Frankel ranking,the neurological function recovered,with the degree varying from 1 to 3.[Conclusion]It's a good method to apply the open and reduction,decompression of spinal canal with bone grafting and fusion operation.This kind of operation can get perfect treating effect by providing good fixation and reducing the complications.

African swine fever virus(ASFV)I177L gene deletion vaccine is one of the key directions of African swine fever(ASF)live attenuated vaccine research and development.In order to effec-tively distinguish between the wild-type ASFV strain and the I177L gene-deleted strain,specific primers and probes were designed based on ASFV B646L and I177L genes,respectively.After screening and optimization,a duplex real-time PCR method was developed that can simultaneously detect these two genes.The results showed that ASFV B646L and I177L genes were detected spe-cifically and simultaneously by the method developed without cross-reactions with porcine circovir-us type 2,Seneca virus A,classical swine fever virus,foot-and-mouth disease virus,porcine respira-tory and reproductive syndrome virus.The detection limits of the duplex real-time PCR for recom-binant plasmids pUC57-B646L and pUC57-I177L were 1×103 copies/mL.The intra-and inter-as-say coefficients of variation were less than 4％,respectively.Detection of 122 pork and pork prod-ucts using the duplex real-time PCR developed and the real-time PCR recommended by WOAH showed that the coincidence rates of the two methods for B646L gene detection was 100％with two amplification curves appeared in the positive results of the established methods.The method established in this study can be used for the detection of ASFV I177L gene deletion strains,which provides technical support for ASF surveillance and epidemiological investigation.