Intestinal DiseasesImmunoproliferative Small Intestinal DiseaseMaltaEnteritisMalabsorption SyndromesIntestinal Diseases, ParasiticDiverticulitisImmunoglobulin alpha-ChainsSprue, TropicalIntestinal MucosaIntestine, SmallCampylobacter InfectionsCrohn DiseaseCommunicable DiseasesIntestinesDysenteryFecesCeliac DiseaseInflammatory Bowel DiseasesIntestinal NeoplasmsCaliciviridae InfectionsGastrointestinal DiseasesGastroenteritisDiarrheaNorovirusEnglandCampylobacterEnterocolitis, NecrotizingWalesClostridium difficileIleumColitis, UlcerativeCampylobacter jejuniIntestinal AbsorptionJejunumColitisProbioticsColonBiopsyIncidenceInfant, NewbornCohort StudiesPolymerase Chain ReactionDisease Models, AnimalMice, Inbred C57BL