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Severe early life respiratory syncytial virus (RSV) infection is associated with persistent immune alterations. Previously, our group had shown that adult mice orally supplemented with Lactobacillus johnsonii exhibited decreased airway immunopathology following RSV infection. Here, we demonstrate that offspring of mice supplemented with L. johnsonii exhibit reduced airway mucus and Th2 cell\u2013mediated response to RSV infection. Maternal supplementation resulted in a consistent gut microbiome in mothers and their offspring. Importantly, supplemented maternal plasma and breastmilk, and offspring plasma, exhibited decreased inflammatory metabolites. Cross-fostering studies showed that prenatal Lactobacillus exposure led to decreased Th2 cytokines and lung inflammation following RSV infection, while postnatal Lactobacillus exposure diminished goblet cell hypertrophy and mucus production in the lung in response to airway infection. These studies demonstrate that Lactobacillus modulation of the maternal microbiome and associated metabolic reprogramming enhance airway protection against RSV in neonates.<\/jats:p>","DOI":"10.1084\/jem.20210235","type":"journal-article","created":{"date-parts":[[2021,10,9]],"date-time":"2021-10-09T15:37:48Z","timestamp":1633793868000},"update-policy":"https:\/\/doi.org\/10.1084\/jem.crossmarkpolicy","source":"Crossref","is-referenced-by-count":58,"title":["Maternal gut microbiome regulates immunity to RSV infection in offspring"],"prefix":"10.1084","volume":"218","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8982-4633","authenticated-orcid":true,"given":"Wendy","family":"Fonseca","sequence":"first","affiliation":[{"name":"Department of Pathology, University of Michigan, Ann Arbor, MI 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