Related Experiment Videos
Development of gut colonisation in pre-term neonates
Insights
Pre-term infant gut microflora differs significantly from full-term infants, with delayed colonization and altered bacterial composition. This unique microbial development pattern in premature neonates requires careful consideration during clinical assessments.
Area of Science:
- Neonatal microbiology
- Gastrointestinal microbiome research
- Infant health and development
Background:
- The gut microbiome plays a crucial role in infant health.
- Premature infants have unique physiological characteristics that may influence microbial colonization.
- Understanding the early-life microbiome is essential for neonatal care.
Purpose of the Study:
- To investigate the development of microflora in the throat, stomach, and faeces of low birth weight, pre-term infants during their first three weeks of life.
- To compare the gut microbial colonization patterns in pre-term infants with those of healthy full-term infants.
- To assess the impact of parenteral feeding and antibiotics on the developing microflora.
Main Methods:
- Monitoring of microflora in throat, stomach, and faeces of 28 pre-term, low birth weight infants.
- Analysis of bacterial colonization patterns during the first 3 weeks of life.
- Comparison of flora with healthy breast-fed and artificially fed full-term infants.
Main Results:
- Delayed colonization of throat (87%) and stomach (60%) beyond 4 days in pre-term infants.
- Stomach flora was sparse and resembled faecal flora; faecal flora established faster.
- Initial dominance of Bacteroides spp. shifted towards Escherichia coli and gram-negative bacilli; gram-positive bacteria colonization was slow.
- Parenteral feeding and antibiotics were associated with delayed and restricted microbial colonization.
- No systemic spread of bacteria via the bloodstream was detected.
Conclusions:
- The enteric tract colonization pattern in pre-term infants differs significantly from healthy full-term infants.
- Delayed and altered microbial development in pre-term neonates necessitates careful interpretation of bacteriological test results.
- The findings highlight the vulnerability of the pre-term infant microbiome and its potential impact on health outcomes.
Abstract:
Twenty-eight pre-term babies of low birth weight were monitored for developing microflora in throat, stomach and faeces during the first 3 weeks of life. The flora at all levels of the gastrointestinal tract differed from that of healthy breast-fed and artificially fed full-term babies. Colonisation of throat and stomach was delayed beyond 4 days of life in 87% and 60% of babies respectively. Only 10% of babies had "normal" oral flora throughout the period of study. Flora of the stomach was sparse, and resembled faecal flora. Faecal flora was established more rapidly than throat or stomach flora, and 70% of babies were colonised during the first 4 days of life. Initially Bacteroides spp. were predominant (57% babies), but Escherichia coli and other aerobic gram-negative bacilli gradually increased in frequency. Colonisation by gram-positive bacteria was slow. Clostridium spp. were present in only 10% of babies during the first 4 days of life. Most strains were transient. Colonisation with C. butyricum (30%), C. perfringens (35%) and C. difficile (25%) was maximum after the first 2 weeks of life. Lactic-acid-producing bacteria usually appeared late in the third week of life. Parenteral feeding immediately after birth was associated with delayed colonisation by a restricted number of species. Parenteral antibiotics (penicillin or gentamicin or both) restricted colonisation with normal oral flora, the lactic-acid-producing bacteria and penicillin-sensitive clostridia, but had little effect on E. coli even when the colonising strain was sensitive to the aminoglycoside in the regimen. Systemic spread of bacteria via the blood stream was not detected in any babies. The pattern of colonisation of the enteric tract in pre-term infants in the special-care nursery studied, differs from that of healthy full-term babies; this merits consideration when the results of bacteriological tests of this vulnerable group of infants are being interpreted.