VITORA: Clinical Study to Evaluate the Effect of KB109 on the Gut Microbiome in Subjects Whose Gastrointestinal Tracts Are Colonized With Multiple Drug-resistant Organisms

Inclusion Criteria: * Be male or female, ≥18 years of age * Positive stool culture for at least one of these three organisms: VRE, ESBLE or CRE * Be willing and able to give informed consent * If taking probiotic or prebiotic dietary supplements, usage must be consistent within 7 days prior to the run-in phase and willing to remain consistent throughout the study * If subject is female: subject is surgically sterile or post-menopausal (12 months with no menses without an alternate medical cause); or if subject is a female of childbearing potential, must have a negative urine pregnancy test at Screening, must not be lactating, and must agree to abstain from sexual activity or agree to use one highly effective method of contraception for the duration of the study Exclusion Criteria: * Planned escalation of immunosuppression * Neutropenia (≤500 absolute neutrophil count per μL) * Allogenic stem cell transplant recipients with ongoing gastrointestinal disease * Rapidly progressive or terminal illness * Hemodynamic instability, or any other significant systemic, unstable or untreated disease * Currently receiving or anticipated to require systemic (oral or IV anti-infective) or gut-directed antibacterial therapy * Recent history of the following conditions requiring medical attention: known or suspected gastrointestinal (GI) infection (e.g., viral or bacterial gastroenteritis) or inflammatory bowel disease * Major intra-abdominal surgery related to the bowel within the 3 months prior to Run-In * Receiving total parenteral nutrition * Contraindications, sensitivity, or known allergy to the use of the study product or its components * Individuals who, in the opinion of the Investigator, are considered to be poor attendees or unlikely for any reason to be able to comply with the study procedures (e.g., planned procedures)