Luminescence was measured using a FLUOstar Optima luminometer (BMG Labtech, Offenburg, Germany). All samples were measured in triplicate and all experiments were performed at least three times. Motility assay Freshly grown bacterial colonies were stabbed into motility agar (0.2% agar) plates. The plates were incubated face up at 37°C for 16 to 24 h, and motility was assessed find more by measuring the migration of bacteria through the agar by zone of growth. Results are expressed (in mm) as the mean ± standard deviation of triplicate colonies from 3 independent experiments. Acknowledgements We are indebted to Professor Mark Pallen and Sophie Mathews for helpful discussions and advice. We are also
grateful to Gad Frankel for the strain, ICC171. We gratefully acknowledge Ben Adler, Simon Harris and Paul Cullen at Monash University for their assistance with two-dimensional gel electrophoresis and MALDI-TOF analysis. This work was supported by grants to ELH and RLF from the Australian Research Council and the Australian National Health and Medical Research Council (NHMRC). LB was the recipient of a NHMRC Dora Lush Postgraduate Scholarship. SB was supported by an Australian CBL0137 purchase Research Council (ARC) Australian Research Fellowship. References 1. Robins-Browne RM: Traditional enteropathogenic Escherichia coli
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