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A systematic review of breast milk microbiota composition and the evidence for transfer to and colonisation of the infant gut

In: Beneficial Microbes
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C.A. Edwards Human Nutrition, School of Medicine, Dentistry, and Nursing, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow Royal Infirmary, 84 Castle St, Glasgow G4 0SF, United Kingdom.

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C.A. Van Loo-Bouwman Yili Innovation Center Europe, Bronland 12 E-1, 6708 WH Wageningen, the Netherlands.

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J.A. Van Diepen Medical and Scientific Affairs, Reckitt|Mead Johnson Nutrition Institute, Middenkampweg 2, 6545 CJ Nijmegen, the Netherlands.

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M.H. Schoemaker Medical and Scientific Affairs, Reckitt|Mead Johnson Nutrition Institute, Middenkampweg 2, 6545 CJ Nijmegen, the Netherlands.

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S.E. Ozanne Metabolic Research Laboratories and MRC Metabolic Diseases Unit, Wellcome Trust-MRC Institute of Metabolic Science, University of Cambridge, P.O. Box 289, Cambridge CB2 0QQ, United Kingdom.

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K. Venema Department of Human Biology, Centre for Healthy Eating & Food Innovation, Maastricht University – Campus Venlo, P.O. Box 8, 5900 AA Venlo, the Netherlands.

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C. Stanton Teagasc Moorepark Food Research Centre, and APC Microbiome Ireland, Cork, Ireland.

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V. Marinello Human Nutrition, School of Medicine, Dentistry, and Nursing, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow Royal Infirmary, 84 Castle St, Glasgow G4 0SF, United Kingdom.

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R. Rueda R&D Department, Abbott Nutrition, Cam. de Purchil, 68, 18004 Granada, Spain.

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M. Flourakis ILSI Europe a.i.s.b.l., E. Mounierlaan 83, 1200 Brussels, Belgium; correspondence has been taken over by C.-Y. Chang of ILSI Europe.

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A. Gil Department of Biochemistry and Molecular Biology II, School of Pharmacy, Institute of Nutrition and Food Technology ‘José Mataix,’ Biomedical Research Centre, University of Granada, and Instituto de Investigación Biosanitaria ibs Granada, Avda. del Conocimiento s/n, 18100, Armilla, Grenada, Spain.
CIBEROBN (Physiopathology of Obesity and Nutrition), Instituto de Salud Carlos III (ISCIII), 28029 Madrid, Spain.

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E.M. Van der Beek Department of Pediatrics, University Medical Centre Groningen, University of Groningen, Postbus 30.001, 9700 RB Groningen, the Netherlands.
Danone Nutricia Research, Uppsalalaan 12, 3584 CT Utrecht, the Netherlands.

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Open Access

The intestinal microbiota plays a major role in infant health and development. However, the role of the breastmilk microbiota in infant gut colonisation remains unclear. A systematic review was performed to evaluate the composition of the breastmilk microbiota and evidence for transfer to/colonisation of the infant gut. Searches were performed using PUBMED, OVID, LILACS and PROQUEST from inception until 18th March 2020 with a PUBMED update to December 2021. 88 full texts were evaluated before final critique based on study power, sample contamination avoidance, storage, purification process, DNA extraction/analysis, and consideration of maternal health and other potential confounders. Risk of skin contamination was reduced mainly by breast cleaning and rejecting the first milk drops. Sample storage, DNA extraction and bioinformatics varied. Several studies stored samples under conditions that may selectively impact bacterial DNA preservation, others used preculture reducing reliability. Only 15 studies, with acceptable sample size, handling, extraction, and bacterial analysis, considered transfer of bacteria to the infant. Three reported bacterial transfer from infant to breastmilk. Despite consistent evidence for the breastmilk microbiota, and recent studies using improved methods to investigate factors affecting its composition, few studies adequately considered transfer to the infant gut providing very little evidence for effective impact on gut colonisation.

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