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We describe the isolation of one strain of Shiga toxin-producing Escherichia coli O91:H21 from a child with diarrhea in the city of Porto Alegre, RS, Brazil. Considering the pathogenic potential of STEC, these organisms should be looked for more carefully among our population.doi:10.1590/s1517-83822000000400005 fatcat:jjkkd77bzjemjcgodjn5orcexm