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Host cell cytotoxicity induced by A. baumannii OMVs. A549 cells were treated with OMVs from A. baumannii strains for 24 h and then cell viability was determined using the MTT assay. Data are presented as mean ± SD of three independent experiments. + p < 0.01 compared to untreated control cells. ** p < 0.01 comparing the same concentration of OMVs from A. baumannii ATCC 17978
