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The role in sporadic enteritis of facultatively enteropathogenic Escherichia coli serogroups
Abstract:
During a two-year period, 2411 faecal specimens and 514 throat swabs were cultured from 1674 persons, mainly infants and children. Of 31 Escherichia coli serogroups considered to represent facultatively enteropathogenic agents, the following were encountered: O4, O18a,b, O18a,c, O19, O20, O25, O28a,b, O32, O51, O53, O75, O78, O79, O105, O112a,c, O114, O115, O117, O129, O143, O145, O148. There was no significant difference in the incidence of the organisms and their serogroup distribution between patients with enteritis, patients with extraintestinal diseases and healthy individuals. A rise of antibody titre in some of the patients indicated an association with enteritis in case of serogropus O4, O18a,c, O19, O25, O75, O78 and O117. It has been assumed that the presence in faeces of a facultatively pathogenic E. coli serogroup does not necessarily prove its aetiological relationship to the disease.
Insights
This study investigated Escherichia coli (E. coli) serogroups in children, finding no significant difference in incidence among healthy individuals and those with enteritis or extraintestinal diseases. Some E. coli serogroups were associated with enteritis, but their presence doesn't confirm causality.
Area of Science:
- Microbiology
- Pediatrics
- Infectious Diseases
Background:
- Enteropathogenic Escherichia coli (EPEC) are a significant cause of diarrheal disease, particularly in infants and children.
- Identifying specific E. coli serogroups associated with enteritis is crucial for understanding disease etiology.
- The role of facultatively pathogenic E. coli serogroups in pediatric infections requires further investigation.
Purpose of the Study:
- To determine the incidence and distribution of specific Escherichia coli serogroups in fecal and throat samples from infants and children.
- To investigate the association between E. coli serogroups and clinical outcomes, including enteritis and extraintestinal diseases.
- To evaluate the etiological significance of facultatively pathogenic E. coli serogroups in pediatric infections.
Main Methods:
- Culturing of 2411 fecal specimens and 514 throat swabs collected over two years from 1674 individuals, primarily infants and children.
- Identification and serogrouping of Escherichia coli isolates.
- Analysis of the incidence and distribution of 31 specific E. coli serogroups considered potentially enteropathogenic.
- Comparison of E. coli serogroup prevalence between patients with enteritis, extraintestinal diseases, and healthy controls.
- Assessment of antibody titers in patients to determine potential associations with enteritis.
Main Results:
- A total of 31 Escherichia coli serogroups, considered facultatively enteropathogenic, were identified.
- No significant differences were observed in the incidence or serogroup distribution of these E. coli strains between patients with enteritis, extraintestinal diseases, and healthy individuals.
- Elevated antibody titers in some patients suggested an association between specific serogroups (O4, O18a,c, O19, O25, O75, O78, and O117) and enteritis.
- The presence of a facultatively pathogenic E. coli serogroup in fecal samples did not definitively prove its etiological role in disease.
Conclusions:
- The study found a broad distribution of potentially enteropathogenic E. coli serogroups in the pediatric population, irrespective of disease status.
- While certain E. coli serogroups showed a correlation with enteritis based on antibody responses, their presence alone is insufficient to establish causality.
- Further research is needed to elucidate the complex relationship between E. coli serogroups and pediatric gastrointestinal and extraintestinal infections.