Objective: To study the effect on human umbilical vein endothelial cell(HUVEC) permeability by Dengue Virus type 2(DENV-2)and prokaryotic protein of 1- 476 sequences of dengue virus type 2 M and NGC strains. Methods: HUVEC monolayer cells were vaccinated with E gene 1-476 sequence prokaryotic expression products of strains DENV-2 M and DENV-2 NGC,as well as DENV-2. The HUVEC permeability was tested by Transwell method,and transmission electron microscope(TEM) was used to observe ultrastructure changes of ce...