Abstract
Saliva antibodies to Escherichia coli O157 were investigated as markers of the immune response in children with enteropathic hemolytic uremic syndrome (HUS). Paired serum and saliva samples were collected from 22 children with HUS during acute disease and convalescence and were tested for E. coli O157 lipopolysaccharide (LPS)-specific IgM and IgA antibodies by ELISA. Serum and saliva samples from 44 age-matched controls were used to establish the cut-off values. Elevated levels of IgM and/or IgA antibodies to O157 LPS were detected in saliva of 13/13 HUS patients with Shiga toxin-producing E. coli (STEC) O157 in stool culture and from 4 of 5 HUS patients in whom STEC were not detected. These results closely mirrored the results obtained with paired serum samples. In contrast, saliva and serum samples from four children with STEC isolates belonging to O-groups O26, O145 (n = 2), and O165 lacked detectable O157 LPS-specific antibodies. The specificity of the ELISA was confirmed by western blotting. In STEC O157 culture-confirmed cases, the sensitivity of the ELISA was 92% for saliva IgM and IgA, based on the first available sample, and 100% and 92%, respectively, when subsequent samples were included. The specificity was 98% for IgM and 100% for IgA. Children with E. coli O157 HUS demonstrate a brisk, easily detectable immune response as reflected by the presence of specific antibodies in their saliva. Saliva-based immunoassays offer a reliable, noninvasive method for the diagnosis of E. coli O157 infection in patients with enteropathic HUS.
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Abbreviations
- HUS:
-
Hemolytic uremic syndrome
- STEC:
-
Shiga toxin-producing Escherichia coli
- Ig:
-
Immunoglobulin
- LPS:
-
Lipopolysaccharide
- ELISA:
-
Enzyme linked immunosorbent assay
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Acknowledgements
We thank Maike Westphal for excellent technical assistance. The help of Prof. Paul-Michael Kaulfers in preparation of the LPS is gratefully acknowledged. The help of colleagues (Dr. Hans Altrogge, Dr. Kirsten Timmermann, and Dr. Melanie Dietz) and the staff nurses of pediatric nephrology unit, Hamburg, in patient care and sample collection is gratefully acknowledged. Part of this work appears in the doctoral thesis of Enke Grabhorn.
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Ludwig, K., Grabhorn, E., Bitzan, M. et al. Saliva IgM and IgA Are a Sensitive Indicator of the Humoral Immune Response to Escherichia coli O157 Lipopolysaccharide in Children with Enteropathic Hemolytic Uremic Syndrome. Pediatr Res 52, 307–313 (2002). https://doi.org/10.1203/00006450-200208000-00026
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DOI: https://doi.org/10.1203/00006450-200208000-00026
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