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Displacement of EPEC strain E2348/69 by GOS. Bacteria were incubated with HEp-2 cells for 60 min (⧫). To parallel mixtures, GOS was added after 10 (▪), 20 (▴), and 30 min (•), as indicated by the arrows, and incubated for an additional 30 min. The percent adherence was determined from the number of HEp-2 cells out of 100 with localized adherence.
