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Recovery of challenge E. coli from treated catheters. The paired bars represent the medians of six, two and two experiments, respectively. No colicin-susceptible organisms were recovered from catheters pre-coated with the colicin producing strain in any of the six trials. The difference in the cfu/cm of ColS and ColR recovered from catheters coated with colicin-producing E. coli K-12 was statistically significant (P = 0.009, Wilcoxon Rank Sum test).
