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Interquartile range box plots showing the relative fitness (W) of each phenotype when competed against a marked ancestral strain of SBW25 (SBW-LacZ). Mucoid phenotypes engage in apparent competition which confers a signicant fitness advantage in the presence of phage sensitive bacteria; asterisk (*) indicates a significant difference compared to control. The large variability in fitness for UM phenotypes is attributed to the UM phenotype being phage positive or negative.
