Intestinal DiseasesImmunoproliferative Small Intestinal DiseaseMaltaEnteritisMalabsorption SyndromesIntestinal Diseases, ParasiticDiverticulitisImmunoglobulin alpha-ChainsSprue, TropicalIntestinal MucosaIntestine, SmallCampylobacter InfectionsCrohn DiseaseCommunicable DiseasesIntestinesDysenteryFecesCeliac DiseaseInflammatory Bowel DiseasesIntestinal NeoplasmsCaliciviridae InfectionsGastrointestinal DiseasesGastroenteritisNorovirusDiarrheaEnglandCampylobacterEnterocolitis, NecrotizingWalesClostridium difficileIleumColitis, UlcerativeCampylobacter jejuniIntestinal AbsorptionJejunumColitisProbioticsColonBiopsyIncidencePolymerase Chain ReactionInfant, NewbornDisease Models, AnimalCohort StudiesMice, Inbred C57BL