Microbiota in the feces of children with diarrhea at admission. Each block represents a bacterial genus. The color value changes from red to yellow and displays the percentage value (50% to 0%) of a given bacterial genus. The bacterial genera with fewer than five determined sequences, or <1% in a given sample, or unrecognized bacteria are not shown. The patients were divided into three groups. Group A were patients with diarrheagenic E. coli and Shigella. Group B were patients with diarrhea of unknown etiology and fecal samples collected only at admission. Group C were patients with diarrhea of unknown etiology and fecal samples collected at admission, during recovery, and after recovery. *S. sonnei was isolated from patient 044.