Nucleic acid detection and sequence analysis of arboviruses in Xichang / 中华检验医学杂志

Objective:To understand the prevalence of arboviruses in mosquito samples in Xichang City, Sichuan Province, and enrich the data of arbovirus activity and genetic characteristics in southwestern Sichuan Province.Methods:In June 2018, the nucleic acid was extracted from Culex tritaeniorhynchus mosquitoes collected from different pigsties in three villages and suburbs of Xichang City. The specific primers of Yunnan orbivirus, Banna virus, Tibet orbivirus (S7, S10), Flavivirus and alphavirus were used for quantitative polymerase chain reaction examination, and the positive product was cloned for sequencing analysis. Results:A total of 9 012 mosquitoes were collected, of which Cx. tritaeniorhynchus was the dominant species. A number of 88 batches of these mosquitoes were amplified, and 2 strains of Japanese encephalitis virus (JEV), 7 strains of Banna virus (BAV), 7 strains of Tibet orbivirus (TIBOV) and 1 strain of Yunnan orbivirus virus (YOUV) were detected, respectively. By the results of cluster analysis and evolutionary tree analysis, the 17 newly found virus strains were close to the Yunnan isolates, and 2 JEV strains were located in the GI-b clade. The other 7 strains of BAV were A2 evolutionary clades. Of the 7 TIBOV plants, 6 were located in the same clade. One TOUV was in the same clade as the Yunnan strain. Conclusions:Culex tritaeniorhynchus mosquitoes in Xichang city might carry JEV, BAV, YOUV and TIBOV, among them JEV was GI-b type and BAV was A2 type. The results provide data supporting the detection and analysis of arboviruses in Xichang city.

ISOLATION AND PURIFICATION OF HUMAN FIBRONECTIN,PREPARATION OF ANTISERA AND ITS PRACTICAL USE / 中国法医学杂志

The fibronectin was purified from human plasma by Gelatin-Sepharose 4B affinity chromatography. The rabbits were immunized with the fibronectin. the raw anti-fibronectin sera were absorbed bythe solid phase of the fibronectin free human serum. Then the specific anti-fibronectin sera were obtained. The fibronectins deposited on human bullet wounds, incised wounds as well as on blunt forceinJuries were demonst.ated by PAP immunohistochemical study using diluted anti-fibronectin serum.The results were quite sati factory.