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Biofilm-forming ability of E. coli O157:H7, nonadapted (control) or adapted in 0.16 mg/ml thymol (1/2T), carvacrol (1/2 C), or trans-cinnamaldehyde (1/2TC), in TSB. Different capital letters (A and B) represent statistically significant (P < 0.05) differences between control and EO-adapted cells.
