Gastrointestinal DiseasesGastrointestinal TractDigestive SystemGastrointestinal NeoplasmsGastroenterologyFecesEnterocolitis, NecrotizingProbioticsClostridium perfringensDyspepsiaIrritable Bowel SyndromeEndoscopy, GastrointestinalDiarrheaDigestive System Physiological PhenomenaIntestinal MucosaUpper Gastrointestinal TractInflammatory Bowel DiseasesEnteritisIntestinesHelicobacter InfectionsPeptic UlcerStomachSan MarinoEnterocolitisCrohn DiseaseIntestinal DiseasesHelicobacter pyloriGastrointestinal AgentsGastrointestinal MotilityStomach DiseasesGastroenteritisColonic Diseases, FunctionalGastric MucosaGastritisCalculiColonIntubation, GastrointestinalClostridium InfectionsCeliac DiseaseDuodenumIntestine, SmallLower Gastrointestinal TractDuodenal DiseasesExocrine Pancreatic InsufficiencyJejunumStomach UlcerColitis, UlcerativeDuodenal UlcerGastric JuiceIntestinal AbsorptionFoodborne DiseasesStomach NeoplasmsCampylobacter jejuniPancreatic DiseasesEosinophiliaUrinary Tract InfectionsCampylobacter InfectionsEndoscopyClostridium difficileEnterotoxinsGastroesophageal RefluxGiardiasisPolymerase Chain ReactionUrinary TractDog DiseasesCecumBiopsyBacterial ProteinsIntestine, LargeLiver DiseasesSensitivity and SpecificityMolecular Sequence DataBacterial ToxinsRetrospective StudiesEnteric Nervous SystemDNA, BacterialVirulence FactorsPrevalenceCytomegalovirus InfectionsGerm-Free LifeAnti-Bacterial AgentsEvaluation Studies as TopicChronic DiseaseGastrointestinal ContentsInfant, NewbornCase-Control StudiesIleumRisk FactorsRespiratory Tract InfectionsLactobacillusDogsDisease OutbreaksPyramidal TractsAntigens, BacterialProspective StudiesGastrointestinal HemorrhageSequence Analysis, DNATime FactorsTreatment OutcomeGastrointestinal Transit