Infection/resistance estimates as 'Reduction in Bacterial Growth' (RBG) for 20 clones isolated from each of the phage containing populations at transfer 20. Each clone was estimated against each of the 12 phage populations. The morphology and plasmid status (0, plasmid free or 1, plasmid containing) of each clone is also included. Treatments are identified as plasmid free (FP) and plasmid containing (PP).