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(A) Survival of wild-type (▪) and chromosomally lux-marked (□) E. coli O157:H7 in artificial groundwater at 15°C. (B) The potential luminescence (pRLU) of the lux-marked strain (▪) dropped at an equivalent rate to the cell numbers, as seen from the potential luminescence per cell (○) response. Only data until day 45 are shown, as potential luminescence values dropped below the detection level after this time point. Data represent the mean of three replicates ± standard deviation.
