Intestinal DiseasesImmunoproliferative Small Intestinal DiseaseMaltaEnteritisMalabsorption SyndromesIntestinal Diseases, ParasiticDiverticulitisImmunoglobulin alpha-ChainsSprue, TropicalIntestinal MucosaIntestine, SmallCampylobacter InfectionsCrohn DiseaseCommunicable DiseasesIntestinesDysenteryFecesInflammatory Bowel DiseasesCeliac DiseaseIntestinal NeoplasmsCaliciviridae InfectionsGastrointestinal DiseasesGastroenteritisDiarrheaNorovirusEnglandCampylobacterEnterocolitis, NecrotizingWalesClostridium difficileIleumColitis, UlcerativeIntestinal AbsorptionCampylobacter jejuniJejunumColitisProbioticsColonBiopsyDisease Models, AnimalIncidencePolymerase Chain ReactionInfant, NewbornCohort StudiesMice, Inbred C57BL