Perinatal Microbiomes’ Influence on Preterm Birth and Preterms’ Health
Influencing Factors and Modulation Strategies
Corresponding Author
Lorena Ruiz
Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid
Address correspondence and reprint requests to Lorena Ruiz, Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Avda. Puerta de Hierro s/n, 28040 Madrid, Spain (e-mail: [email protected]).Search for more papers by this authorLaura Moles
Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid
Search for more papers by this authorMiguel Gueimonde
Department of Microbiology and Biochemistry of Dairy Products, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas, IPLA-CSIC, Paseo Río Linares, Asturias, Spain
Search for more papers by this authorJuan M. Rodriguez
Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid
Search for more papers by this authorCorresponding Author
Lorena Ruiz
Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid
Address correspondence and reprint requests to Lorena Ruiz, Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Avda. Puerta de Hierro s/n, 28040 Madrid, Spain (e-mail: [email protected]).Search for more papers by this authorLaura Moles
Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid
Search for more papers by this authorMiguel Gueimonde
Department of Microbiology and Biochemistry of Dairy Products, Instituto de Productos Lácteos de Asturias, Consejo Superior de Investigaciones Científicas, IPLA-CSIC, Paseo Río Linares, Asturias, Spain
Search for more papers by this authorJuan M. Rodriguez
Department of Nutrition, Food Science and Food Technology, Complutense University of Madrid, Madrid
Search for more papers by this authorThe authors report no conflicts of interest.
ABSTRACT
Microbial communities inhabiting the human host play important roles in maintaining health status, including reproduction and early life programming, which is particularly important in the context of preterm neonates’ health. Preterm birth (PTB) is often the result of a microbial dysbiosis or infection. In addition, preterm neonates experience different levels of organ immaturity and an abnormal gut microbiota establishment, as compared to full-term neonates. This exacerbates their developmental problems and can have negative consequences at systemic level. In addition, preterm babies are commonly exposed to delayed enteral feeding and hospital environments, which increases the risk of short- and long-term health problems. Some of these clinical conditions, such as necrotizing enterocolitis or sepsis, may be life threatening, whereas others may translate into life-long conditions, including cognitive problems. Increasing scientific interest has focused on understanding developmental problems in preterm neonates related to abnormalities in the settlement of their microbial communities, with the final goal of selecting appropriate microbiome-targeted strategies (eg, probiotics), to reduce preterm health risks and improve overall quality of life.
This review aims to summarize current knowledge on microbiological factors influencing PTB initiation and gastrointestinal development, and on the health consequences to the preterm neonate. Scientific evidences on dietary strategies reducing PTB incidence and minimizing sequelae in this particularly sensitive human group subpopulation are also discussed.
REFERENCES
- 1.Blencowe H, Cousens S, Oestergaard MZ, et al. National, regional, and worldwide estimates of preterm birth rates in the year 2010 with time trends since 1990 for selected countries: a systematic analysis and implications. Lancet 2012; 379: 2162–2172.
- 2.Liu L, Oza S, Hogan D, et al. Global, regional, and national causes of child mortality in 2000-13, with projections to inform post-2015 priorities: an updated systematic analysis. Lancet 2015; 385: 430–440.
- 3.Lawn JE, Gravett MG, Nunes TM, et al. Global report on preterm birth and stillbirth (1 of 7): definitions, description of the burden and opportunities to improve data. BMC Pregnancy Childbirth 2010; 10 (suppl 1): S1.
- 4. WHO. The Global Burden of Disease: 2004 Update. Geneva: World Health Organization; 2008.
- 5.Menon R, Torloni MR, Voltolini C, et al. Biomarkers of spontaneous preterm birth: an overview of the literature in the last four decades. Reprod Sci 2011; 18: 1046–1070.
- 6.Bhattacharya S, Rajav EA, Mirazo ER, et al. Inherited predisposition to spontaneous preterm delivery. Obstet Gynecol 2010; 115: 1125–1133.
- 7.Varner MW, Esplin MS. Current understanding of genetic factors in preterm birth. BJOG 2005; 112 (suppl 1): 28–31.
- 8.Engel SA, Erichsen HC, Savitz DA, et al. Risk of spontaneous preterm birth is associated with common proinflammatory cytokine polymorphisms. Epidemiology 2005; 16: 469–477.
- 9.Wagner CL, Baggerly C, McDonnell SL, et al. Post-hoc comparison of vitamin D status at three time points during pregnancy demonstrates lower risk of preterm birth with higher vitamin D closer to delivery. J Steroid Biochem Mol Biol 2015; 148: 256–260.
- 10.Staneva A, Bogossian F, Prichard M, et al. The effects of maternal depression, anxiety, and perceived stress during pregnancy on preterm birth: a systematic review. Women Birth 2015; 28: 179–193.
- 11.McDonald SD, McKinney B, Foster G, et al. The combined effects of maternal depression and excess weight on neonatal outcomes. Int J Obes (Lond) 2015; 39: 1033–1040.
- 12.Goldenberg RL, Culhane JF, Iams JD. Epidemiology and causes of preterm birth. Lancet 2008; 371: 75–84.
- 13.Zi MY, Longo PL, Bueno-Silva B, et al. Mechanisms involved in the association between periodontitis and complications in pregnancy. Front Public Health 2015; 2: 290.
- 14.Aagaard K, Ma J, Antony KM, et al. The placenta harbors a unique microbiome. Sci Transl Med 2014; 6: 237–249.
- 15.Stout MJ, Conlon B, Landeau M, et al. Identification of intracellular bacteria in the basal plate of the human placenta in term and preterm gestations. Am J Obstet Gynecol 2013; 208: 226.
- 16.Doyle RM, Alber DG, Jones HE, et al. Term and preterm labour are associated with distinct microbial community structures in placental membranes which are independent of mode of delivery. Placenta 2014; 35: 1099–1101.
- 17.Jiménez E, Fernández L, Marín ML, et al. Isolation of commensal bacteria from umbilical cord blood of healthy neonates born by cesarean section. Curr Microbiol 2005; 51: 270–274.
- 18.Funkhouser LJ, Bordenstein SR. Mom knows best: the universality of maternal microbial transmission. PLoS Biol 2013; 11: e1001631.
- 19.Jones HE, Harris K, Azizia M. Differing prevalence and diversity of bacterial species in fetal membranes from very preterm and term labor. PLoS One 2009; 4: e8205.
- 20.Romano-Keeler J, Weitkamp JH. Maternal influences on fetal microbial colonization and immune development. Pediatr Res 2015; 77: 189–195.
- 21.Solt I. The human microbiome and the great obstetrical syndromes: a new frontier in maternal-fetal medicine. Best Pract Res Clin Obstet Gynaecol 2015; 29: 165–175.
- 22.Krauss-Silva L, Almada-Horta A, Alves MB, et al. Basic vaginal pH, bacterial vaginosis and aerobic vaginitis: prevalence in early pregnancy and risk of spontaneous preterm delivery, a prospective study in a low socioeconomic and multiethnic South American Population. BMC Pregnancy Childbirth 2014; 14: 107.
- 23.Agger WA, Siddiqui D, Lovrich SD, et al. Epidemiologic factors and urogenital infections associated with preterm birth in a midwestern U.S. population. Obstet Gynecol 2014; 124: 969–977.
- 24.Stockham S, Stamford JE, Roberts CT, et al. Abnormal pregnancy outcomes in mice using an induced periodontitis model and the haematogenous migration of Fusobacterium nucleatum sub-species to the murine placenta. PLoS One 2015; 10: e0120050.
- 25.Ercan E, Eratalay K, Deren O, et al. Evaluation of periodontal pathogens in amniotic fluid and the role of periodontal disease in pre-term birth and low birth weight. Acta Odontol Scand 2013; 71: 553–559.
- 26.Kim AJ, Lo AJ, Pullin DA, et al. Scaling and root planning treatment for periodontitis to reduce preterm birth and low birth weight: a systematic review and meta-analysis of randomized controlled trials. J Periodontol 2012; 83: 1508–1519.
- 27.Thinkhamrop J, Hofmeyr GJ, Adetoro O, et al. Antibiotic prophylaxis during the second and third trimester to reduce adverse pregnancy outcomes and morbidity. Cochrane Database Syst Rev 2015; 1: CD002250.
- 28.Soto A, Martín V, Jiménez E, et al. Lactobacilli and bifidobacteria in human breast milk: influence of antibiotherapy and other host and clinical factors. J Pediatr Gastorenterol Nutr 2014; 59: 78–88.
- 29.Stokholm J, Schjørring S, Eskildsen CE, et al. Antibiotic use during pregnancy alters the commensal vaginal microbiota. Clin Microbiol Infect 2014; 20: 629–635.
- 30.Arboleya S, Sánchez B, Milani C, et al. Intestinal microbiota development in preterm neonates and effect of perinatal antibiotics. J Pediatr 2015; 166: 538–544.
- 31.Witkin SS. The vaginal microbiome, vaginal anti-microbial defence mechanisms and the clinical challenge of reducing infection-related preterm birth. BJOG 2014; 122: 213–218.
- 32.DiGiulio DB, Callahan BJ, McMurdie PJ. Temporal and spatial variation of the human microbiota during pregnancy. Proc Natl Acad Sci USA 2015; 112: 11060–11065.
- 33.Hyman RW, Fukushima M, Jiang H, et al. Diversity of the vaginal microbiome correlates with preterm birth. Reprod Sci 2014; 21: 32–40.
- 34.Shiozaki A, Yoneda S, Yoneda N, et al. Intestinal microbiota is different in women with preterm birth: results from terminal restriction fragment length polymorphism analysis. PLoS One 2014; 9: e111374.
- 35.Vitali B, Cruciani F, Baldassarre ME, et al. Dietary supplementation with probiotics during late pregnancy: outcome on vaginal microbiota and cytokine secretion. BMC Microbiol 2012; 12: 236.
- 36.Rautava S, Collado MC, Salminen S, et al. Probiotics modulate host-microbe interaction in the placenta and fetal gut: a randomized, double-blind, placebo-controlled trial. Neonatology 2012; 102: 178–184.
- 37.Yang S, Li W, Challis JR, et al. Probiotic Lactobacillus rhamnosus GR-1 supernatant prevents lipopolysaccharide-induced preterm birth and reduces inflammation in pregnant CD-1 mice. Am J Obstet Gynecol 2014; 211: 44.
- 38.Siggers RH, Siggers J, Thymann T, et al. Nutritional modulation of the gut microbiota and immune system in preterm neonates. J Nutr Biochem 2011; 22: 511–521.
- 39.Koenig JE, Spor A, Scalfone N, et al. Succession of microbial consortia in the developing infant gut microbiome. Proc Natl Acad Sci USA 2011; 108 (suppl): 14578–14585.
- 40.LaTuga MS, Ellis JC, Cotton CM, et al. Beyond bacteria: a study of the enteric microbial consortium in extremely low birth weight infants. PLoS One 2011; 6: e27858.
- 41.Arboleya S, Binetti A, Salazar N, et al. Establishment and development of intestinal microbiota in preterm neonates. FEMS Microbiol Ecol 2012; 79: 763–772.
- 42.Hansen CH, Nielsen DS, Kverka M, et al. Patterns of early gut colonization shape future immune responses of the host. PLoS One 2012; 7: e34043.
- 43.Olszak T, An D, Zeissig S, et al. Microbial exposure during early life has persistent effects on natural killer T cell function. Science 2012; 336: 489–493.
- 44.Cox LM, Yamanishi S, Sohn J, et al. Altering the intestinal microbiota during a critical developmental window has lasting metabolic consequences. Cell 2014; 158: 705–721.
- 45.Ley RE, Hamady M, Lozupone C, et al. Evolution of mammals and their gut microbes. Science 2008; 320: 1647–1651.
- 46.Renz H, Brandtzaeg P, Hornef M. The impact of perinatal immune development on mucosal homeostasis and chronic inflammation. Nat Rev Immunol 2012; 2: 9–23.
10.1038/nri3112 Google Scholar
- 47.Sommer F, Bäckhed F. The gut microbiota--masters of host development and physiology. Nat Rev Microbiol 2013; 11: 227–238.
- 48.Claus SP, Tsang TM, Wang Y, et al. Systemic multicompartmental effects of the gut microbiome on mouse metabolic phenotypes. Mol Syst Biol 2008; 4: 219.
- 49.Neuman H, Debelius JW, Knight R. Microbial endocrinology: the interplay between the microbiota and the endocrine system. FEMS Microbiol Rev 2015; 39: 509–521.
- 50.Diaz-Heijtz R, Wang S, Anuar F, et al. Normal gut microbiota modulates brain development and behavior. Proc Natl Acad Sci USA 2011; 108: 3047–3052.
- 51.Mayer EA, Knight R, Mazmanian SK. Gut microbes and the brain: paradigm shift in neuroscience. J Neurosci 2014; 34: 15490–15496.
- 52.Borre YE, O’Keeffe GW, Clarke G, et al. Microbiota and neurodevelopmental windows: implications for brain disorders. Trends Mol Med 2014; 20: 509–518.
- 53.Turroni F, Peano C, Pass DA, et al. Diversity of bifidobacteria within the infant gut microbiota. PLoS One 2012; 7: e36957.
- 54.Bergström A, Skov TH, Bahl MI, et al. Establishment of intestinal microbiota during early life: a longitudinal, explorative study of a large cohort of Danish infants. Appl Environ Microbiol 2012; 80: 2889–2900.
- 55. The Human Microbiome Project Consortium. A framework for human microbiome research. Nature 2012; 486: 215–221.
- 56.Dominguez-Bello MG, Costello EK, Contreras M, et al. Delivery mode shapes the acquisition and structure of the initial microbiota across multiple body habitats in newborns. Proc Natl Acad Sci USA 2010; 107: 11971–11975.
- 57.Jakobsson HE, Abrahamsson TR, Jenmalm MC, et al. Decreased gut microbiota diversity, delayed Bacteroidetes colonization and reduced Th1 responses in infants delivered by caesarean section. Gut 2014; 63: 559–566.
- 58.Bäckhed F, Roswall J, Peng Y, et al. Dynamics and stabilization of the human gut microbiome during the first year of life. Cell Host Microbe 2015; 17: 690–703.
- 59.Fouhy F, Guinane CM, Hussey S, et al. High-Throughput sequencing reveals the incomplete, short-term recovery of infant gut microbiota following parenteral antibiotic treatment with ampicillin and gentamicin. Antimicrob Agents Chemother 2012; 56: 5811–5820.
- 60.Faa G, Gerosa C, Fanni D, et al. Factors influencing the development of a personal tailored microbiota in the neonate, with particular emphasis on antibiotic therapy. J Matern Fetal Neonatal Med 2013; 26 (suppl 2): 35–43.
- 61.Gomez-Llorente C, Plaza-Diaz J, Aguilera M, et al. Three main factors define changes in fecal microbiota associated with feeding modality in infants. J Pediatr Gastroenterol Nutr 2013; 57: 461–466.
- 62.Leach ST, Lui K, Naing Z, et al. Multiple opportunistic pathogens, but not pre-existing inflammation, may be associated with necrotizing enterocolitis. Dig Dis Sci 2015; 60: 3728–3734.
- 63.Madan JC, Salari RC, Saxena D, et al. Gut microbial colonisation in premature neonates predicts neonatal sepsis. Arch Dis Child Fetal Neonatal Ed 2012; 97: F456–F462.
- 64.Mai V, Torrazza RM, Ukhanova M, et al. Distortions in development of intestinal microbiota associated with late onset sepsis in preterm infants. PLoS One 2013; 8: e52876.
- 65.Morrow AL, Lagomarcino AJ, Schibler KR, et al. Early microbial and metabolomic signatures predict later onset of necrotizing enterocolitis in preterm infants. Microbiome 2013; 1: 13.
- 66.Sangild PT, Siggers RH, Schmidt M, et al. Diet- and colonization-dependent intestinal dysfunction predisposes to necrotizing enterocolitis in preterm pigs. Gastroenterology 2006; 130: 1776–1792.
- 67.Wagner CL. Amniotic fluid and human milk: a continuum of effect? J Pediatr Gastroenterol Nutr 2002; 34: 513–514.
- 68.Cho CK, Shan SJ, Winsor EJ, et al. Proteomics analysis of human amniotic fluid. Mol Cell Proteomics 2007; 6: 1406–1415.
- 69.Yoshio H, Tollin M, Gudmundsson GH, et al. Antimicrobial polypeptides of human vernix caseosa and amniotic fluid: implications for newborn innate defense. Pediatr Res 2003; 53: 211–216.
- 70.Siggers JL, Siggers RH, Skovgaard K, et al. Oral administration of amniotic fluid reduces necrotizing enterocolitis in preterm pigs. Gastroenterology 2008; 134: A259.
- 71.Østergaard MV, Shen RL, Støy AC, et al. Provision of amniotic fluid during parenteral nutrition increases weight gain with limited effects on gut structure, function, immunity, and microbiology in newborn preterm pigs. J Parenter Enteral Nutr 2016; 40: 552–566.
- 72.Barney CK, Lambert DK, Alder SC, et al. Treating feeding intolerance with an enteral solution patterned after human amniotic fluid: a randomized, controlled, masked trial. J Perinatol 2007; 27: 28–31.
- 73.Jiménez E, Marín ML, Martín R, et al. Is meconium from healthy newborns actually sterile? Res Microbiol 2008; 159: 187–193.
- 74.Meier PP, Engstrom JL, Patel AL, et al. Improving the use of human milk during and after the NICU stay. Clin Perinatol 2010; 37: 217–245.
- 75.Castellote C, Casillas R, Ramírez-Santana C, et al. Premature delivery influences the immunological composition of colostrum and transitional and mature human milk. J Nutr 2011; 141: 1181–1187.
- 76.Dvorak B, Fituch CC, Williams CS, et al. Concentrations of epidermal growth factor and transforming growth factor-alpha in preterm milk. Adv Exp Med Biol 2004; 554: 407–409.
- 77.Moles L, Manzano S, Fernández L, et al. Bacteriological, biochemical, and immunological properties of colostrum and mature milk from mothers of extremely preterm infants. J Pediatr Gastroenterol Nutr 2015; 60: 120–126.
- 78.Howlett A, Ohlsson A, Plakkal N. Inositol in preterm infants at risk for or having respiratory distress syndrome. Cochrane Database Syst Rev 2015; 2: CD000366.
- 79.Asakuma S, Urashima T, Akahori M, et al. Variation of major neutral oligosaccharides levels in human colostrum. Eur J Clin Nutr 2008; 62: 488–494.
- 80.Cabrera-Rubio R, Collado MC, Laitinen K, et al. The human milk microbiome changes over lactation and is shaped by maternal weight and mode of delivery. Am J Clin Nutr 2012; 96: 544–551.
- 81.Obermajer T, Lipoglavšek L, Tompa G, et al. Colostrum of healthy Slovenian mothers: microbiota composition and bacteriocin gene prevalence. PLoS One 2015; 10: e0123324.
- 82.Underwood MA, Gaerlan S, De Leoz ML, et al. Human milk oligosaccharides in premature infants: absorption, excretion, and influence on the intestinal microbiota. Pediatr Res 2015; 78: 670–677.
- 83.Rodriguez NA, Meier PP, Groer MW, et al. A pilot study of the oropharyngeal administration of own mother's colostrum to extremely low birth weight infants. Adv Neonatal Care 2010; 10: 206–212.
- 84.Johnson TJ, Patel AL, Bigger HR, et al. Economic benefits and costs of human milk feedings: a strategy to reduce the risk of prematurity-related morbidities in very-low-birth-weight infants. Adv Nutr 2014; 5: 207–212.
- 85.Reisinger KW, De Vaan L, Kramer BW, et al. Breast-feeding improves gut maturation compared with formula feeding in preterm babies. J Pediatr Gastroenterol Nutr 2014; 59: 720–724.
- 86.Taylor SN, Basile LA, Ebeling M, et al. Intestinal permeability in preterm infants by feeding type: mother's milk versus formula. Breastfeed Med 2009; 4: 11–15.
- 87.Conde-Agudelo A, Belizan JM, Diaz-Rossello J. Kangaroo mother care to reduce morbidity and mortality in low birthweight infants. Cochrane Database Syst Rev 2011; 16: CD002771.
- 88.Hendricks-Muñoz KD, Xu J, Parkih HI, et al. Skin-to-Skin care and the development of the preterm infant oral microbiome. Am J Perinatol 2015; 32: 1205–1216.
- 89. WHO/UNICEF. Global strategy for infant and young child feeding. http://apps.who.int/iris/bitstream/10665/42590/1/9241562218.pdf. Accessed March 31, 2016.
- 90. American Academy of Pediatrics. Section on breastfeeding. Breastfeeding and the use of human milk. Pediatrics 2012; 129: e827–e841.
- 91.O’Connor DL, Ewaschuk JB, Unger S. Human milk pasteurization: benefits and risks. Curr Opin Clin Nutr Metab Care 2015; 18: 269–275.
- 92.Zhou P, Li Y, Ma L. The role of immunonutrients in the prevention of necrotizing enterocolitis in preterm very low birth weight infants. Nutrients 2015; 7: 7256–7270.
- 93.Arslanoglu S. Donor human milk for preterm infants: current evidence and research directions. J Pediatr Gastroenterol Nutr 2013; 57: 535–542.
- 94.Arboleya S, Gonzalez S, Salazar N, et al. Development of probiotic products for nutritional requirements of specific human populations. Eng Life Sci 2012; 12: 368–376.
- 95.Alfaleh K, Anabrees J. Probiotics for prevention of necrotizing enterocolitis in preterm infants. Evid Based Child Health 2014; 9: 584–671.
- 96.Osborn DA, Sinn JK. Prebiotics in infants for prevention of allergy. Cochrane Database Syst Rev 2013; 3: CD006474.
- 97.Srinivasjois R, Rao S, Patole S. Prebiotic supplementation in preterm neonates: updated systematic review and meta-analysis of randomized controlled trials. Clin Nutr 2013; 32: 958–965.
- 98.Cuello-García CA, Brozek JL, Fiocchi A, et al. Probiotics for the prevention of allergy: a systematic review and meta-analysis of randomized controlled trials. J Allergy Clin Immunol 2015; 136: 952–961.
- 99.Ahmadi E, Alizadeh-Navaei R, Rezai MS. Efficacy of probiotic use in acute rotavirus diarrhea in children: a systematic review and meta-analysis. Caspian J Intern Med 2015; 6: 187–195.
- 100.West CE, Jenmalm MC, Kozyrksyj AL, et al. Probiotics for treatment and primary prevention of allergic diseases and asthma: looking back and moving forward. Expert Rev Clin 2016; 4: 1–15.
- 101.Wang Q, Dong J, Zhu Y. Probiotic supplement reduces risk of necrotizing enterocolitis and mortality in preterm very low-birth-weight infants: an updated meta-analysis of 20 randomized, controlled trials. J Pediatr Surg 2012; 47: 241–248.
- 102.Ofek Shlomai N, Deshpande G, Rao S, et al. Probiotics for preterm neonates: what will it take to change clinical practice? Neonatology 2014; 105: 64–70.
- 103.Janvier A, Malo J, Barrington KJ. Cohort study of probiotics in a North American neonatal intensive care unit. J Pediatr 2014; 164: 980–985.
- 104.Abrahamsson TR, Rautava S, Moore AM, et al. The time for a confirmative necrotizing enterocolitis probiotics prevention trial in the extremely low birth weight infant in North America is now!. J Pediatr 2014; 165: 389–394.
- 105.Deshpande GC, Rao SC, Keil AD, et al. Evidence-based guidelines for use of probiotics in preterm neonates. BMC Med 2011; 9: 92.
- 106.Costeloe K, Hardy P, Juszczak E, et al. Bifidobacterium breve BBG-001 in very preterm infants: a randomised controlled phase 3 trial. Lancet 2016; 387: 649–660.
- 107.Armanian AM, Sadeghnia A, Hoseinzadeh M, et al. The effect of neutral oligosaccharides on reducing the incidence of necrotizing enterocolitis in preterm infants: a randomized clinical trial. Int J Prev Med 2014; 5: 1387–1395.
- 108.Dilli D, Aydin B, Fettah ND, et al. The propre-save study: effects of probiotics and prebiotics alone or combined on necrotizing enterocolitis in very low birth weight infants. J Pediatr 2015; 166: 545–551.
- 109.Jacobs SE, Tobin JM, Opie GF, et al. Probiotic effects on late-onset sepsis in very preterm infants: a randomized controlled trial. Pediatrics 2013; 132: 1055–1062.
- 110.Olsen R, Greisen G, Schrøder M, et al. Prophylactic probiotics for preterm infants: a systematic review and meta-analysis of observational studies. Neonatology 2015; 109: 105–112.
- 111.Luoto R, Ruuskanen O, Waris M, et al. Prebiotic and probiotic supplementation prevents rhinovirus infections in preterm infants: a randomized, placebo-controlled trial. J Allergy Clin Immunol 2014; 133: 405–413.
- 112.Modi M, Uthaya S, Fell J. A randomized, double-blind, controlled trial of the effects of prebiotic oligosaccharides on enteral tolerance in preterm infants. Pediatr Res 2010; 68: 440–445.
- 113.Dasopoulou M, Briana DD, Boutsikou T, et al. Motilin and gastrin secretion and lipid profile in preterm neonates following prebiotics supplementation: a double-blind randomized controlled study. J Parenter Enteral Nutr 2015; 39: 359–368.
- 114.Athalye-Jape G, Deshpande G, Rao S, et al. Benefits of probiotics on enteral nutrition in preterm neonates: a systematic review. Am J Clin Nutr 2014; 100: 1508–1519.
- 115.Arboleya S, Salazar N, Solís G, et al. Assessment of intestinal microbiota modulation ability of Bifidobacterium strains in in vitro fecal batch cultures from preterm neonates. Anaerobe 2013; 19: 9–16.
- 116.Arboleya S, Ruas-Madiedo P, Margolles A, et al. Characterization and in vitro properties of potentially probiotic Bifidobacterium strains isolated from breast-milk. Int J Food Microbiol 2011; 149: 28–36.
- 117.Fernández L, Langa S, Martín V, et al. The human milk microbiota: origin and potential roles in health and disease. Pharmacol Res 2013; 69: 1–10.
- 118.Moles L, Escribano E, de Andrés J, et al. Administration of Bifidobacterium breve PS12929 and Lactobacillus salivarius PS12934, two strains isolated from human milk, to very low and extremely low birth weight preterm infants: a pilot study. J Immunol Res 2015; 2015b: 538171.
- 119.Moles L, Gómez M, Heilig H, et al. Bacterial diversity in meconium of preterm neonates and evolution of their fecal microbiota during the first month of life. PLoS One 2013; 8: e66986.
- 120.Rousseau C, Levenez F, Fouqueray C, et al. Clostridium difficile colonization in early infancy is accompanied by changes in intestinal microbiota composition. J Clin Microbiol 2011; 49: 858–865.
- 121.Luoto R, Isolauri E, Lehtonen L. Safety of Lactobacillus GG probiotic in infants with very low birth weight: twelve years of experience. Clin Infect Dis 2010; 50: 1327–1328.
- 122.Bertelli C, Pillonel T, Torregrossa A, et al. Bifidobacterium longum bacteremia in preterm infants receiving probiotics. Clin Infect Dis 2015; 60: 924–927.
- 123.Zbinden A, Zbinden R, Berger C, et al. Case series of Bifidobacterium longum bacteremia in three preterm infants on probiotic therapy. Neonatology 2015; 107: 56–59.
- 124.Van Nood E, Vrieze A, Nieuwdorp M, et al. Duodenal infusion of food feces for recurrent Clostridium difficile. N Engl J Med 2013; 368: 407–415.
- 125.Petrof EO, Gloor GB, Vanner SJ, et al. Stool substitute transplant therapy for the eradication of Clostridium difficile infection: ‘RePOOPulating’ the gut. Microbiome 2013; 1: 3.