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Results from growth competition experiments (1:1) between E. coli 83972 and UPEC strains after 17 h of growth in human urine. Each value is an average of four individual shake flasks obtained from two separate experiments in different batches of urine. In all four competition experiments, strain 83972 was present in significantly higher numbers than the UPEC isolate (paired two-tailed t test, P < 0.001).
