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C555-91 exhibits AAF/I-dependent aggregative adherence to HEp-2 cells. Bacterial aggregative patterns of adherence (arrows) after 3 h of incubation of EAEC 042 or wild-type (WT) C555-91 with HEp-2 cells. The C555-91 AAF/I mutant strain failed to adhere to the HEp-2 cells or to the substratum.
