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Cytopathic effect (CPE) of different sequence type (ST) strains on Vero cells [scanning electron microscopy (SEM)]. Cells were incubated with stool filtrates at 37°C, for 24 h. Following incubation, cells were visualized by scanning electron microscope. Representative images of (A) Vero cells only, and Vero cells treated with (B–H) ST2, ST4, ST6, ST13, ST37, ST42, and ST104-positive stool supernatants, respectively. Scale bar: 200, 100, and 10 μm. n = 3.
