Objective To investigate the invasive ability of leptospires with different virulence to endothelial monolayers and the changes in permeability of endothelial monolayers. Methods Intact endothelial monolayer models were constructed with EAhy926 cells and Transwell chamber,and were infected by Leptospira virulent 56606v strains,attenuated 56606a strains,saprophytic Patoc I strains,Salmonella 14028 strains and E.coli DH5α strains,respectively.The numbers of bacteria translocated into the lower Transwell chamb...