Fig 3. Effect of rpoS on the adherence of EPEC.
Competition for adherence to epithelial cells between the wild-type strains (E2348/69 and LRT9) against their respective rpoS∷Tn10 mutants (A) and between E2348/69 and LRT9 strains against each other (B). Bacteria were suspended in DMEM over a monolayer of HEp-2 cells for 3 hours. The adhered bacteria were then released and seeded on L-agar or on L-agar supplemented with tetracycline for CFU counting.