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Shiga toxin-producing Escherichia coli in household members of children with hemolytic uremic syndrome

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Abstract

The objective is to establish the frequency of STEC infections in household contacts of HUS patients. We studied 292 household contacts of 82 HUS patients attended from 2010 to 2018. In HUS cases, diagnostic criteria were (1) isolation and characterization of STEC strains, (2) detection of free fecal Shiga toxin (FFStx), and (3) detection of anti-O serogroup-specific antibodies. Contacts were studied by screening of stx genes by polymerase chain reaction and/or STEC isolation from stool samples. Clonal relation of STEC strains was established by pulsed-field gel electrophoresis (PFGE). Frequencies of HUS patients without STEC isolation with STEC-positive contacts were determined. Serotypes and stx-genotypes in patients and contacts were analyzed. Thirty (36.6%) HUS patients had 36 STEC-positive contacts. Fourteen (38.8%) were children, 20 adults, and 2 dogs. One sibling developed HUS, 6 contacts had gastrointestinal symptoms, and the rest were asymptomatic. In 5 of 30 HUS patients, STEC infection could not be confirmed, and 2 cases were diagnosed only by FFStx detection. Of the remaining 23 HUS patients, 16 had E. coli O157 and 7 E. coli O145 infection. Serotype and/or stx-genotype concordance was established in 19 (83%) of 23 HUS patients and their contacts. Five HUS cases and their contacts studied by PFGE showed macrorestriction patterns with more than 90% similarity. Nearly one third of HUS patients had STEC-positive family contacts, and one third of them were children. Early identification is important to prevent ongoing contamination among family and institutional contacts and to facilitate prompt detection of HUS in STEC-positive contacts.

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Authors and Affiliations

  1. Pediatric Nephrology Unit, Hospital Interzonal General Dr. Jose Penna, Bahía Blanca, Argentina

    Laura Fernanda Alconcher & Lucas Ivan Lucarelli

  2. Instituto Nacional de Enfermedades Infecciosas, ANLIS “Dr. Carlos G. Malbrán”, Buenos Aires, Argentina

    Marta Rivas

  3. Microbiology Laboratory, Hospital Interzonal General Dr. Jose Penna, Bahía Blanca, Argentina

    Jimena Galavotti & Mabel Rizzo

Authors
  1. Laura Fernanda Alconcher
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  2. Marta Rivas
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  3. Lucas Ivan Lucarelli
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  4. Jimena Galavotti
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  5. Mabel Rizzo
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Correspondence to Laura Fernanda Alconcher.

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The Review Board and Ethics Committee of the Hospital approved this study.

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Alconcher, L.F., Rivas, M., Lucarelli, L.I. et al. Shiga toxin-producing Escherichia coli in household members of children with hemolytic uremic syndrome. Eur J Clin Microbiol Infect Dis 39, 427–432 (2020). https://doi.org/10.1007/s10096-019-03738-1

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  • DOI: https://doi.org/10.1007/s10096-019-03738-1

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