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In vitro competition experiments between SSuT E. coli isolates from 18 farms (indicated by letters A to Q) and susceptible E. coli isolates. Each circle represents average of three replicate experiments. Error bars, standard errors. CI is given by (X − Y)/(X + Y), where X is the number of SSuT colonies and Y is the number of susceptible colonies. When CI is 1, only SSuT strains remain in the broth culture. WSU, Washington State University dairy SSuT isolates.
