Abstract
The microbiota is the complex community of microorganisms that colonize the human body. The gut microbiota is the most diverse and abundant, hosting more than 100 trillion microbial cells and 1,000 different species. Among its several functions, the gut microbiota contributes to the modulation of the immune response and oral tolerance to foods. Gut dysbiosis, which refers to alterations or imbalances in the composition and/or function of the gut microbiota, has been described in several metabolic and immune disorders, including inflammatory bowel disease, celiac disease, obesity, asthma, and allergies. The structure of the microbiota in the first 6 months of life is relevant in the development of allergies, and gut dysbiosis could influence both their appearance and course. One of the most common food allergies is cow’s milk allergy (CMA). This work aims to present a bibliographic overview of the characteristics of the gut microbiota in patients with CMA, identify the factors that influence its conformation at an early age, and analyze whether certain alterations in the microbiota could be associated with the development of CMA. For this purpose, a bibliographic search was performed in PubMed (pubmed.ncbi.nlm.nih.gov), using the indicated keywords, and clinical studies and reviews from the last 15 years were selected and analyzed. The bibliography consulted shows that, despite technological advances in sequencing and bioinformatic analysis, the bacteria involved in the development of allergic diseases are not yet known in detail, and even controversial results have been found. This shows the need to continue advancing in the study of the microbiota of pediatric populations, and of the alterations that occur in children with CMA.
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