Intestinal DiseasesImmunoproliferative Small Intestinal DiseaseMaltaEnteritisMalabsorption SyndromesIntestinal Diseases, ParasiticDiverticulitisImmunoglobulin alpha-ChainsSprue, TropicalIntestinal MucosaIntestine, SmallCrohn DiseaseCampylobacter InfectionsCommunicable DiseasesIntestinesDysenteryFecesCeliac DiseaseInflammatory Bowel DiseasesIntestinal NeoplasmsGastrointestinal DiseasesCaliciviridae InfectionsEnglandDiarrheaGastroenteritisNorovirusCampylobacterEnterocolitis, NecrotizingWalesClostridium difficileIleumColitis, UlcerativeCampylobacter jejuniIntestinal AbsorptionJejunumColitisProbioticsColonBiopsyIncidenceInfant, NewbornCohort StudiesPolymerase Chain ReactionDisease Models, AnimalMice, Inbred C57BL