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Aggregative adherence (AA) pattern exhibited by an atypical EAEC (aatA+/aggR−) isolate (IAL 6006) that harbored the afp operon. Note the bacterial stacked brick-like arrangement, characteristic of the AA pattern, on both epithelial cells and coverslip surfaces detected in adherence assay performed with 3 h of infection. Scale bar = 10 μm.
