A 4-year-old girl who was positive for adenovirus according to a rapid immunochromatographic test conducted at a hospital, progressed to hemorrhagic diarrhea and hemolytic uremic syndrome (HUS). The presence of adenovirus serotype 41 (AdV-41) was confirmed by TaqMan real-time PCR and sequence analysis. However, most enteric viral infections cause mild to moderate diarrhea. In the present case, enterohemorrhagic Escherichia coli (EHEC) O165:HNM was isolated concomitantly with AdV-41. In addition, O165 antibody was specifically detected in patient sera. The EHEC isolate was positive for the virulence genes stx1, stx2a, eae type ε, ehxA, and norV. Therefore, we concluded that EHEC O165:HNM was the precise pathogen leading to HUS in this patient.
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