Growth of individual strains and In vitro competition in human urine. A. DS17 (filled diamonds) and AKP168 (squares) were grown separately in vitro in three different human urines (U1, U2 & U3). B. 1:1 mixture of DS17 and AKP168 mutant was grown in the three different human urines (U1, U2 & U3) and samples were taken at the indicated time points to determine the percentage of AKP168 mutant. C. The same competitions as in B. but plotted as CFU with DS17 depicted as filled diamonds and AKP168 as squares.