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Assessment of Intestinal Transcytosis of Neonatal Escherichia coli Bacteremia Isolates
Published on: February 17, 2023
Enterobacterial microflora in infancy - a case study with enhanced enrichment
Jouni Pesola1, Elias Hakalehto
1Institute of Clinical Medicine, School of Medicine, Faculty of Health Sciences, University of Eastern Finland, P.O.B. 1627, FI-70211 Kuopio, Finland. jouni.pesola@kuh.fi
Objective:
To validate PMEU (Portable Microbe Enrichment Unit) method for monitoring the composition and development of infantile intestinal enterobacterial microflora.
Methods:
A case study of a boy with neonatal sepsis is presented. During the first 32 months, he was given 19 systemic antibiotic treatments representing seven different antibiotic classes. Seven fecal samples collected at ages from 3.4 to 31.6 months were studied for enterobacterial strains by a combination of enhanced enrichment culture in the PMEU and plate culture. The identification and phenotypic characterization of the isolates was performed by biochemical tests.
Results:
37/51 (73%) of the enterobacterial isolates were detected only after the PMEU enrichment. In most samples Escherichia coli strains were predominating, but also several Enterobacter, Klebsiella, Pantoea and Proteus strains could be isolated. It seemed that the antibiotic medications remarkably delayed the development of the intestinal microflora, because first enterobacterial strains were detected only after 6 months of age.
Conclusions:
The enrichment step turned out to essentially improve the characterization and monitoring of the intestinal enterobacterial microbiota of infants. Compared to plate culture the amount of isolates was 2.6-fold by the PMEU enrichment. This study gives an idea on the development and succession of microbial communities in the gastrointestinal tract and on the variation of the strains due to the intestinal environmental factors.
Insights
The Portable Microbe Enrichment Unit (PMEU) method significantly improves monitoring of infant gut bacteria. This technique detected 73% more enterobacterial isolates than traditional methods, aiding in understanding microbial development.
Area of Science:
- Microbiology
- Pediatric Medicine
- Gastroenterology
Background:
- Infant gut microbiota development is crucial for health.
- Antibiotic use can disrupt the developing intestinal microflora.
- Accurate monitoring methods are needed for infant gut health.
Observation:
- A case study involved a boy with neonatal sepsis receiving multiple antibiotic treatments.
- Fecal samples were analyzed using both PMEU enrichment and traditional plate culture.
- Enterobacterial strains were identified through biochemical testing.
Findings:
- The PMEU method detected 73% more enterobacterial isolates than plate culture alone.
- Escherichia coli was predominant, with other genera also identified.
- Antibiotic treatment appeared to delay the establishment of gut microflora until after 6 months of age.
Implications:
- The PMEU method offers a more comprehensive approach to characterizing infant enterobacterial microbiota.
- This technique can provide insights into microbial community development and strain variation.
- Enhanced detection capabilities aid in understanding the long-term effects of antibiotics on infant gut health.
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