Objective To construct a chimeric infectious clone of the fatal virulent strain SDLY 107, containing the gene fragments encoding 2A and 3B proteins of the mild virulent strain SDLY 1, and to establish a reverse genetic system platform for further investigation on virulence of enterovirus 71 strains. Methods The overlap PCR analysis was performed to obtain the gene fragments encoding 2A and 3B pro-teins of the mild virulent strain SDLY 1.The obtained gene fragments were digested and then cloned into a plasmid pMD19-T containing the full-length gene of SDLY 107 strain by using gene replacement strategy. The recombinant RNA was transfected into Vero cells for the preparation of recombinant virus particles.Sev-eral assays including the PCR, indirect immunofluorescence ( IFA) , Western blot and sequencing were per-formed for virus identification.Virus titers were measured by 50%cell culture infective dose ( CCID50 ) and plaque assay.Results The infectious clones of SDLY 107-2A-1 and SDLY 107-3B-1 chimeric virus strains were constructed successfully.Typical cytopathic effect was observed in Vero cells after viral transfection. Identification of the rescued viruses by PCR, IFA, Western blot and sequencing further confirmed the suc-cessful construction of infectious virus strains.The virus titers of SDLY 107-2A-1 and SDLY 107-3B-1 strains detected by CCID50 and plaque assay were 1.25 ×105 PFU/ml and 0.7 ×105 PFU/ml, respectively. Conclusion The chimeric viruses SDLY 107-2A-1 and SDLY 107-3B-1 were rescued successfully, causing cytopathic effects similar to those by using the parental virus strain SDLY 107.This study might pave the way for further investigation on in vitro and in vivo virulence of enterovirus 71 strains.

Objective To systematically evaluate the psychological intervention effect of music therapy on the patients during the digestive endoscopic process.Methods The databases of EMbase,PubMed,Cochrane Library,CNKI,VIP,Wanfang and CSCD were retrieved by computer,the retrieval time was from their establishment to March 2016.The randomized controlled trials (RCTs) on the music therapy application in the digestive endoscopic process were included.The data were independently extracted by 2 researchers for conducting the literature quality assessment.After extracting and checking the data,the meta analysis was performed by using the RevMan 5.3 software.Results Twenty-six RCTs conforming to the standard were included,involving 4593 patients.The meta analysis results showed that the music therapy could alleviate the anxiety status(SMD=-0.82,95％ CI:-1.14--0.49,P＜0.01),relieve the pain perception(WMD=-1.27,95％CI:-1.87--0.66,P＜0.01),remit the vital signs fluctuations of blood pressure,heart rate and respiratory rate(P＜0.01),meanwhile shorten the duration of examination procedure (WMD=-4.64,95％CI:-6.75--2.52,P＜0.01).Conclusion The current evidences indicate that the music application during the digestive endoscopic process can obviously decrease the anxiety status and pain perception.

Objective:To investigate the relationship between Creactive protein(CRP)/albumin ratio (CAR) and lymph node metastasis of gastric cancer. Methods:A total of 96 cases of gastric cancer were included in the study. The clinical pathological stage and lymph node detection in patients with gastric cancer were analyzed, with the preoperative CAR as the dependent variable. Results:1) The pa-tients with preoperative CAR>0.04 has higher transfer rate and metastasis than the patients with preoperative CAR≤0.04, and the dif-ference was significant (P<0.05). The lymph node stage of patients with preoperative CAR>0.04 was significantly higher than that of the patients with preoperative CAR≤0.04, and the difference was significant (P<0.05). 2) The mean CAR of patients with Borrmann typesⅠ,Ⅱ,Ⅲ, andⅣgradually increased;with the progression of the pathological stage of gastric cancer, the mean value of CAR in-creased. 3) During the operation, the total number of lymph node dissections was high and the mean value of CAR before the opera-tion was high. Conclusion:The correlation between preoperative CAR and lymph node metastasis in patients with gastric cancer may reflect the degree of lymph node metastasis to a certain extent.