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Published on: September 18, 2016
The agglutinating antibody response in the duodenum in infants with enteropathic E. coli gastroenteritis
Insights
Infants with enteropathogenic E. coli gastroenteritis mounted antibody responses in duodenal fluid, primarily IgA. Serum antibody levels showed poor correlation, suggesting further research into host or pathogen factors is needed.
Area of Science:
- Pediatrics
- Immunology
- Microbiology
Background:
- Enteropathogenic Escherichia coli (EPEC) infections are a significant cause of infant gastroenteritis.
- Understanding the host immune response is crucial for managing EPEC infections.
Purpose of the Study:
- To investigate the antibody responses in duodenal fluid and serum of infants with EPEC gastroenteritis.
- To characterize the immunoglobulin classes and kinetics of these antibody responses.
Main Methods:
- Serial measurement of agglutinating antibodies in duodenal fluid and serum.
- Analysis of antibody responses in 15 infants diagnosed with EPEC gastroenteritis.
- Identification of antibody immunoglobulin classes (IgA, IgM).
Main Results:
- Peak duodenal antibody levels occurred 8–18 days post-symptom onset, followed by a decline.
- Duodenal antibodies were predominantly IgA, with early IgM detection in younger infants.
- Serum antibody responses were inconsistent, with poor correlation to intestinal antibody titres in some patients.
Conclusions:
- Infants mount a localized duodenal antibody response, primarily IgA, to EPEC infection.
- Discrepancies in serum antibody responses suggest potential roles for host factors or pathogen virulence.
- Further investigation is warranted to elucidate the factors influencing differential antibody responses.
Abstract:
The agglutinating antibody responses in duodenal fluid and serum were measured serially in 15 infants with enteropathogenic E. coli gastroenteritis. Peak levels of duodenal agglutinins were recorded eight to 18 days after the onset of symptoms, and the titres fell within the next seven to 14 days. These antibodies were mainly of the IgA class but IgM antibodies were detected early in the response, especially in the youngest infants. Serum antibody responses were detected in eight patients, but they correlated poorly with the titres of intestinal antibodies. No rise in serum antibodies was found in six infants. Further studies are required to determine whether these differences are host-derived or whether they reflect different pathogenic properties of the infecting organisms.
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