Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12866-021-02161-x/MediaObjects/12866_2021_2161_Fig1_HTML.png)
Timeline of cases involved in the outbreak. Onset of diarrhea in children and adults, hospitalization cases, enterohemorrhagic Escherichia coli (EHEC)-positive cases and/or diagnosis of hemolytic uremic syndrome (HUS) or hemorrhagic colitis (HC), and norovirus-positive cases. Cases that occurred among daycare staff members and external contacts are shown above and below the horizontal line, respectively