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Background Genetic systems have been developed for Chlamydia but the extremely low transformation frequency remains a significant bottleneck. Our goal is to develop a self-replicating transposon delivery vector for C. trachomatis which can be expanded prior to transposase induction. Methods We made E. coli/ C. trachomatis shuttle vectors bearing the Himar1 C9 transposase under control of the tet promoter and a novel rearrangement of the Himar1 transposon with the β-lactamase gene. Activity of the transposase was monitored by immunoblot a