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SEM images of E. coli O157:H7 upon different ultrasound treatments. Note: A, a—Control; B, b—191 W/cm2, 9 min; D,d—191 W/cm2, 18 min; F, f—191 W/cm2, 27 min; C,c—573 W/cm2, 9 min; E, e—573 W/cm2, 18 min; G, g—573 W/cm2, 27 min; Magnification = 20,000 ×, bar marker = 2 µm; Magnification = 50,000 ×, bar marker = 1 µm; Red arrows indicate the occurrence of perforations.
