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When a baby leaves the protection of its mother's womb and comes into the world, its body takes time to adjust to the new environment. It is natural for them to have infections in their first few days and weeks, but a recent research has something else to say.The research suggested that asymptomatic viral infections in the first days and weeks of a baby's life are associated with an increased risk of respiratory infections later in life. The research has been published in 'Nature Microbiology'.Viruses were found to interact with newborns' immune systems and microbiomes -- the community of microbes that live in our body -- in a way that affected both a child's risk and number of subsequent infections.Prevention of such early viral infections, or strengthening immune systems with specially designed probiotics, may avert this risk, experts said.The microbiome of a new born baby can be influenced by many things, including delivery method -- vaginal or caesarean section -- breastfeeding, antibiotics and the hospital environment.Respiratory infections are a major health concern. They are responsible for 15 per cent of deaths for children under the age of five globally and are one of the three main causes of doctors' visits and hospital admittance in the first years of life.Researchers from the University of Edinburgh and University Medical Center Utrecht examined mucosa samples taken from inside the noses of 114 babies at various stages of life as part of the Microbiome Utrecht Infant Study, which has been running for six years.The team analysed the gene activity of the babies' nasal mucosa -- tissue that lines the nasal cavity, the microbes present in the lining of the nose and any viruses that infected the children.When a viral infection was detected in the first days after birth, which largely occurred asymptomatically, the team found that specific mucosal genes were activated, coinciding with a change in the composition of the microbiome, promoting the growth of potentially harmful microbes.The investigators found in particular changes in immune system genes in response to early viruses in affected babies, with especially in genes involved with interferons -- proteins released by immune cells to defend against viruses -- over the first year of life.The interferon-related gene activity caused by an early first viral infection is thought to create a pro-inflammatory environment that makes babies susceptible to future infections, experts said.The cohort study was carried out in close collaboration with the Spaarne Hospital, The Netherlands. The work was funded by Scotland's Chief Scientist Office and the Netherlands Organisation for Scientific Research.Professor Debby Bogaert, Chair of Paediatric Medicine at the University of Edinburgh, said: "We were surprised to see viral infections occur so early in life, and go mostly unnoticed, probably because the infants immune system is in what as known as a state of tolerance after birth. Despite this, these infections seem to affect a normal immune development, which is important to know.""Only from birth onwards will an infant start to develop its microbiome. Limiting the number of viral encounters in those first days to weeks of life might be essential for a healthy immune and microbiome development, and consequently long-term respiratory health."Dr Wouter de Steenhuijsen, post-doctoral investigator at University Medical Center Utrecht, said: "Although further work will be needed to confirm the causality of our findings, the data from this study indicate that early-life encounters with respiratory viruses -- especially during the first days of life -- may set the tone for subsequent non-beneficial host-microbe interactions, which are related to an infection risk and possibly long-term respiratory health."( With inputs from ANI )Disclaimer: This post has been auto-published from an agency feed without any modifications to the text and has not been reviewed by an editor

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When a baby leaves the protection of its mother's womb and comes into the world, its body takes time to adjust to the new environment. It is natural for them to have infections in their first few days and weeks, but a recent research has something el ...