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(A) Confocal microscopy showing the presence of VBNC forms of E. coli O157:H7 BRMSID 188 Tn7gfp in large clusters at 16 days postinoculation on the surface of lettuce leaves. (B) Optical cross-section of the same image that indicates the localization of E. coli O157:H7 cells on the surface of plant tissue. Scale bar, 20 μm.
