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Here, we use an experimental human pneumococcal carriage model (EHPC) to show that\n                    <jats:italic>S. pneumoniae<\/jats:italic>\n                    colonisation is associated with epithelial surface adherence, micro-colony formation and invasion, without overt disease. Interactions between different strains and the epithelium shaped the host transcriptomic response in vitro. Using epithelial modules from a human epithelial cell model that recapitulates our in vivo findings, comprising of innate signalling and regulatory pathways, inflammatory mediators, cellular metabolism and stress response genes, we find that inflammation in the EHPC model is most prominent around the time of bacterial clearance. Our results indicate that, rather than being confined to the epithelial surface and the overlying mucus layer, the pneumococcus undergoes micro-invasion of the epithelium that enhances inflammatory and innate immune responses associated with clearance.\n                  <\/jats:p>","DOI":"10.1038\/s41467-019-11005-2","type":"journal-article","created":{"date-parts":[[2019,7,16]],"date-time":"2019-07-16T06:03:16Z","timestamp":1563256996000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":77,"title":["Microinvasion by Streptococcus pneumoniae induces epithelial innate immunity during colonisation at the human mucosal surface"],"prefix":"10.1038","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6235-550X","authenticated-orcid":false,"given":"Caroline M.","family":"Weight","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cristina","family":"Venturini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7746-3279","authenticated-orcid":false,"given":"Sherin","family":"Pojar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4835-1032","authenticated-orcid":false,"given":"Simon P.","family":"Jochems","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jes\u00fas","family":"Rein\u00e9","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elissavet","family":"Nikolaou","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9129-5569","authenticated-orcid":false,"given":"Carla","family":"Sol\u00f3rzano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4774-0853","authenticated-orcid":false,"given":"Mahdad","family":"Noursadeghi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5650-5361","authenticated-orcid":false,"given":"Jeremy S.","family":"Brown","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0594-0902","authenticated-orcid":false,"given":"Daniela M.","family":"Ferreira","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4573-449X","authenticated-orcid":false,"given":"Robert S.","family":"Heyderman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,7,16]]},"reference":[{"key":"11005_CR1","doi-asserted-by":"publisher","first-page":"893","DOI":"10.1016\/S0140-6736(09)61204-6","volume":"374","author":"KL O\u2019Brien","year":"2009","unstructured":"O\u2019Brien, K. 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