Translocation assays. Percent recovery of leptospires (left) and TER (right) after inoculation of polarized MDCK cell monolayers with L. interrogans Fiocruz L1-130 (L1-130), L. biflexa wild-type strain (Patoc wt), and ligA- (Patoc ligA), and ligB- (Patoc ligB) L. biflexa transformants. Bacteria were inoculated in the upper chamber of MDCK cell monolayer transwell chambers. Translocating bacteria was quantified by counting bacteria in the lower chamber. Assays were performed at 30, 120, and 240 minutes (min) after addition of bacteria. The assays were performed in triplicate, and results are expressed as mean ± SD. The findings of a representative experiment, among three which were performed, are shown.