VE303 for Prevention of Recurrent Clostridioides Difficile Infection (RESTORATiVE303)

May 13, 2026 updated by: Vedanta Biosciences, Inc.

A Randomized, Double-Blind, Placebo-Controlled Phase 3 Study of VE303 for Prevention of Recurrent Clostridioides Difficile Infection

The overall objective of the RESTORATiVE303 study is to evaluate the safety and the Clostridioides difficile infection (CDI) recurrence rate at Week 8 in participants who receive a 14-day course of VE303 or matching placebo. The objectives and endpoints are identical for Stage 1 (recurrent CDI) and Stage 2 (high-risk primary CDI).

Study Overview

Study Type

Interventional

Enrollment (Estimated)

852

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

    • New South Wales
      • Concord, New South Wales, Australia, 2139
        • Withdrawn
        • Concord Repatriation General Hospital
      • Westmead, New South Wales, Australia, 2148
        • Withdrawn
        • Westmead Hospital
    • Victoria
      • Clayton, Victoria, Australia, 3168
        • Withdrawn
        • Monash Health
      • Parkville, Victoria, Australia, 3050
        • Withdrawn
        • Melbourne Health
      • Anderlecht, Belgium, 1070
      • Brussels, Belgium, 1200
        • Recruiting
        • Universite Catholique De Louvain and Cliniques Universitaires Saint-Luc
        • Contact:
      • Ghent, Belgium, 9000
        • Recruiting
        • Universitair Ziekenhuis Gent
        • Contact:
    • Minas Gerais
      • Belo Horizonte, Minas Gerais, Brazil, 30150-221
    • Paraná
      • Curitiba, Paraná, Brazil, 80810-040
        • Recruiting
        • Hospital Nossa Senhora das Graças
        • Contact:
    • Rio Grande do Norte
      • Natal, Rio Grande do Norte, Brazil, 59025-050
        • Recruiting
        • CPCLIN - Centro de Estudos e Pesquisas em Molestias Infecciosas - Pesquisa Clínica
        • Contact:
    • Rio Grande do Sul
      • Caxias do Sul, Rio Grande do Sul, Brazil, 95070-561
        • Recruiting
        • Fundacao Universidade de Caxias do Sul - Hospital Geral de Caxias do Sul
        • Contact:
      • Porto Alegre, Rio Grande do Sul, Brazil, 90035-903
        • Recruiting
        • Hospital de Clinicas de Porto Alegre - UFRGS
        • Contact:
      • Porto Alegre, Rio Grande do Sul, Brazil, 90880-480
        • Recruiting
        • Associação Educadora São Carlos AESC - Hospital Mãe de Deus - Centro de Pesquisa
        • Contact:
    • São Paulo
      • São Paulo, São Paulo, Brazil, 01323-903
        • Recruiting
        • Hospital Alemao Oswaldo Cruz
        • Contact:
      • Burgas, Bulgaria, 8000
        • Withdrawn
        • UMHAT Burgas AD
      • Gorna Oryahovitsa, Bulgaria, 5100
        • Recruiting
        • Multiprofile Hospital for Active Treatment St. Ivan Rilski Gorna Oriahovitsa EOOD
        • Contact:
      • Lom, Bulgaria, 3600
        • Withdrawn
        • Multiprofile Hospital for Active Treatment Sveti Nikolay Chuditvorets EOOD
      • Plovdiv, Bulgaria, 4003
        • Withdrawn
        • Medicinski centar Hipokrat-N EOOD
      • Sliven, Bulgaria, 8800
        • Withdrawn
        • MHAT Dr.Ivan Seliminski - Sliven Ltd.
    • Sofia-Grad
      • Sofia, Sofia-Grad, Bulgaria, 1407
        • Withdrawn
        • Medical Center Excelsior OOD, Base 1
    • Alberta
      • Calgary, Alberta, Canada, T2N 2T9
      • Edmonton, Alberta, Canada, T6G 2X8
      • Red Deer, Alberta, Canada, T4P 1K4
    • British Columbia
      • Vancouver, British Columbia, Canada, V5Z 1M9
        • Recruiting
        • Vancouver Coastal Health Research Institute Clinical Research Unit
        • Contact:
    • New Brunswick
      • Moncton, New Brunswick, Canada, E1C 4B7
    • Newfoundland and Labrador
      • St. John's, Newfoundland and Labrador, Canada, A1B3V6
    • Ontario
      • Hamilton, Ontario, Canada, L8N 4A6
        • Recruiting
        • Research St. Josephs Hamilton
        • Contact:
      • London, Ontario, Canada, N6A 4V2
      • Scarborough Village, Ontario, Canada, M1P 2T7
        • Withdrawn
        • Viable Clinical Research Corporation
      • Toronto, Ontario, Canada, M5G 1L7
        • Recruiting
        • University Health Network
        • Contact:
    • Quebec
      • Chicoutimi, Quebec, Canada, G7H 7Y8
        • Recruiting
        • INTERMED Groupe Sante
        • Contact:
      • Québec, Quebec, Canada, G1V 4G2
      • Kyjov, Czechia, 697 01
        • Withdrawn
        • Nemocnice Kyjov, p.o.
      • Ostrava-Poruba, Czechia, 708 52
        • Withdrawn
        • Fakultni Nemocnice Ostrava
    • Brno-město
      • Brno, Brno-město, Czechia, 625 00
        • Withdrawn
        • Fakultni nemocnice Brno
    • Central Jutland
      • Aarhus, Central Jutland, Denmark, 8200
        • Recruiting
        • Aarhus University Hospital
        • Contact:
      • Tours, France, 37044
        • Recruiting
        • CHRU de Tours
        • Contact:
    • Auvergne-Rhône-Alpes
      • Les Paris, Auvergne-Rhône-Alpes, France, 75014
        • Recruiting
        • Hospital St. Joseph
        • Contact:
    • Franche-Comté
      • Dijon, Franche-Comté, France, 21079
    • Grand Est
      • Paris, Grand Est, France, 51092 Reims Cedex
        • Recruiting
        • Centre Hospitalier Universitaire (CHU) de Reims - Hopital Robert Debre
        • Contact:
    • Hauts-de-France
      • Bordeaux Cedex, Hauts-de-France, France, 33075
        • Recruiting
        • CHU Bordeaux - Hopital Saint Andre Service de medecine interne et maladies infectieuses
        • Contact:
    • Hauts-de-Seine
      • Garches, Hauts-de-Seine, France, 92380
        • Recruiting
        • Assistance Publique-Hopitaux de Paris (AP-HP) - Hopitaux Universitaires Paris Ile-de-France Ouest - Raymond-Poincare
        • Contact:
    • Loire-Atlantique
      • Nantes, Loire-Atlantique, France, 44093
    • Paris
      • Paris, Paris, France, 75018
        • Recruiting
        • Assistance Publique Hôpitaux de Paris Hôpital Bichat- Claude Bernard - Département des maladies infectieuses et tropicales
        • Contact:
    • Rhone
      • Lyon, Rhone, France, 69004
        • Recruiting
        • Hôpital De La Croix Rousse - Gastroenterology
        • Contact:
      • Tbilisi, Georgia, 0159
        • Recruiting
        • LTD "Emergency Cardiology Center named by Acad.G.Chapidze"
        • Contact:
    • K'alak'i T'bilisi
      • Tbilisi, K'alak'i T'bilisi, Georgia, 0112
        • Recruiting
        • ISR-GEO Med Res Clin Healthycore
        • Contact:
      • Tbilisi, K'alak'i T'bilisi, Georgia, 0160
        • Recruiting
        • LTD "Academician Vakhtang Bochorishvili Clinic"
        • Contact:
      • Tbilisi, K'alak'i T'bilisi, Georgia, 0160
        • Recruiting
        • LTD "Aversi Clinic"
        • Contact:
    • Hesse
    • North Rhine-Westphalia
      • Cologne, North Rhine-Westphalia, Germany, 50937
        • Recruiting
        • University Hospital Cologne AöR - Klinik I für Innere Medizin
        • Contact:
    • State of Berlin
      • Berlin, State of Berlin, Germany, 12157
        • Recruiting
        • Epimed GmbH
        • Contact:
      • Budapest, Hungary, 1088
      • Nyíregyháza, Hungary, 4400
        • Withdrawn
        • Szabolcs-Szatmar-Bereg Varmegyei Oktatokorhaz Nyiregyhazi Josa Andras Tagkorhaz
    • Bekes County
      • Békéscsaba, Bekes County, Hungary, 5600
        • Withdrawn
        • Bekes Varmegyei Kozponti Korhaz Dr. Rethy Pal Tagkorhaza
    • Csongrád megye
      • Szeged, Csongrád megye, Hungary, H-6725
        • Withdrawn
        • Szegedi Tudomanyegyetem Szent-Gyorgyi Albert Klinikai Kozpont, I. sz. Belgyogyaszati Klinika
    • Komárom-Esztergom
      • Tatabánya, Komárom-Esztergom, Hungary, 2800
    • Dublin
      • Dublin, Dublin, Ireland, 9
        • Withdrawn
        • Royal College of Surgeons in Ireland - Beaumont Hospital - Education and Research Centre
    • Louth
      • Drogheda, Louth, Ireland, A92 VW28
        • Withdrawn
        • Our Lady of Lourdes Hospital
    • Central District
      • Petah Tikva, Central District, Israel, 4941492
        • Recruiting
        • Rabin Medical Center - Beilinson Hospital
        • Contact:
        • Contact:
      • Tel Aviv, Central District, Israel, 64239
        • Recruiting
        • Tel Aviv Sourasky Medical Center
        • Contact:
      • Ẕerifin, Central District, Israel, 7030000
        • Recruiting
        • Shamir Medical Center (Assaf Harofeh)
        • Contact:
    • Haifa District
      • Haifa, Haifa District, Israel, 34406
        • Recruiting
        • Carmel Medical Center
        • Contact:
    • Haifa North
      • Hadera, Haifa North, Israel, 3810101
        • Recruiting
        • Hillel Yaffe MC, Clinical Research Unit
        • Contact:
        • Contact:
    • Jerusalem
      • Jerusalem, Jerusalem, Israel, 91120
        • Recruiting
        • Hadassah Medical Centre
        • Contact:
    • Southern District
      • Ashkelon, Southern District, Israel, 7830604
        • Recruiting
        • The Barzilai Medical Center
        • Contact:
      • Pisa, Italy, 56124
        • Recruiting
        • AOU Pisana - Stabilimento di Cisanello
        • Contact:
      • Roma, Italy, 00186
    • Alessandria
      • Alessandria, Alessandria, Italy, 15121
        • Recruiting
        • AO Nazionale SS. Antonio e Biagio e C. Arrigo
        • Contact:
    • Lombardy
      • Lecco, Lombardy, Italy, 23900
        • Recruiting
        • PO A. Manzoni di Lecco, ASST Lecco
        • Contact:
    • Milano
      • Milan, Milano, Italy, 20157
        • Recruiting
        • Ospedale Fatebenefratelli e Oftalmico, ASST Fatebenefratelli Sacco
        • Contact:
    • Monza E Brianza
      • Monza, Monza E Brianza, Italy, 20900
        • Recruiting
        • Fondazione IRCCS San Gerardo dei Tintori
        • Contact:
    • Napoli
      • Naples, Napoli, Italy, 80131
        • Recruiting
        • Azienda Ospedaliera Universitaria Federico II
        • Contact:
    • Pavia
      • Pavia, Pavia, Italy, 27100
        • Recruiting
        • IRCCS Policlinico San Matteo, Università degli studi di Pavia
        • Contact:
    • Reggio Emilia
      • Modena, Reggio Emilia, Italy, 41124
        • Recruiting
        • Azienda Ospedaliero-Universitaria di Modena, Policlinico di Modena - Malattie Infettive E Tropicali
        • Contact:
    • Roma
      • Roma, Roma, Italy, 00165
        • Recruiting
        • Osp. Pediatrico Bambino Gesù, IRCCS
        • Contact:
    • Veneto
      • Vittorio Veneto, Veneto, Italy, 31029
        • Recruiting
        • Presidio Ospedaliero di Vittorio Veneto
        • Contact:
    • Aguascalientes
      • Aguascalientes, Aguascalientes, Mexico, 20116
      • Aguascalientes, Aguascalientes, Mexico, 20230
        • Recruiting
        • Hospital Cardiologica Aguascalientes - Investigacion
        • Contact:
    • Morelos
      • Cuernavaca, Morelos, Mexico, 62290
        • Recruiting
        • JM Research S.C - Pediatrics
        • Contact:
    • Nuevo León
      • Monterrey, Nuevo León, Mexico, 64460
        • Recruiting
        • Hospital Universitario "Dr. Jose Eleuterio Gonzalez" - Infectious Diseases
        • Contact:
    • Veracruz
      • Veracruz, Veracruz, Mexico, 91900
        • Recruiting
        • FAICIC S de RL de C.V. - Gastroenterology
        • Contact:
      • Utrecht, Netherlands, 3584 CX
        • Recruiting
        • Universitair Medisch Centrum (UMC) Utrecht - Julius Center for Health Sciences and Primary Care
        • Contact:
    • South Holland
      • Leiden, South Holland, Netherlands, 2333 ZA
        • Recruiting
        • Leids Universitair Medisch Centrum (LUMC)
        • Contact:
        • Contact:
    • Masovian Voivodeship
      • Warsaw, Masovian Voivodeship, Poland, 03-580
        • Withdrawn
        • NZOZ VIVAMED Jadwiga Miecz
    • Silesian Voivodeship
      • Katowice, Silesian Voivodeship, Poland, 40-600
        • Withdrawn
        • Gyncentrum Sp. z o.o.
      • Braga, Portugal, 4710-243
        • Withdrawn
        • CCAB Centro Clinico Academico Braga Associacao - ULS Braga
      • Guarda, Portugal, 6301-858
        • Withdrawn
        • Unidade Local de Saúde da Guarda (ULSG)
      • Porto, Portugal, 4050-011
        • Withdrawn
        • Unidade Local De Saude De Santo Antonio E.P.E.
      • Vila Nova de Gaia, Portugal, 4434-502
        • Withdrawn
        • Unidade Local De Saude De Gaia/Espinho E.P.E.
    • Braga District
      • Guimarães, Braga District, Portugal, 4835-044
        • Withdrawn
        • Unidade Local De Saude Do Alto Ave E.P.E.
    • Coimbra District
      • Coimbra, Coimbra District, Portugal, 3004-591
        • Withdrawn
        • Unidade Local De Saude De Coimbra E.P.E.
    • Lisbon District
      • Almada, Lisbon District, Portugal, 2805-267
        • Withdrawn
        • Unidade Local de Saúde de Almada-Seixal E.P.E.
    • Bucharest
      • Bucharest, Bucharest, Romania, 021105
        • Recruiting
        • Institutul de Boli Infecțioase Prof Dr Matei Bals - Infectious diseases V
        • Contact:
      • Bucharest, Bucharest, Romania, 030303
        • Recruiting
        • Spitalul Clinic de Boli Infectioase si Tropicale Dr Victor Babes
        • Contact:
    • Cluj
      • Cluj-Napoca, Cluj, Romania, 400348
        • Recruiting
        • Spitalul Clinic de Boli Infectioase Cluj-Napoca
        • Contact:
    • Dolj
      • Craiova, Dolj, Romania, 200073
        • Withdrawn
        • Centrul Medical Renasterea
    • Iaşi
      • Iași, Iaşi, Romania, 700116
        • Recruiting
        • Spitalul Clinic de Boli Infectioase Sfanta Parascheva Iasi - Infectious diseases I
        • Contact:
    • Timiș County
      • Timișoara, Timiș County, Romania, 300723
        • Withdrawn
        • Spitalul Clinic Judeţean de Urgenţă Pius Brînzeu Timişoara
    • Gangwon-do
      • Wŏnju, Gangwon-do, South Korea, 26426
        • Recruiting
        • Yonsei University, Wonju Severance Christian Hospital
        • Contact:
    • Seoul Teugbyeolsi
      • Seoul, Seoul Teugbyeolsi, South Korea, 06351
      • Seoul, Seoul Teugbyeolsi, South Korea, 07441
        • Recruiting
        • Hallym University Kangnam Sacred Heart Hospital
        • Contact:
      • Seoul, Seoul Teugbyeolsi, South Korea, 06591
        • Recruiting
        • The Catholic University of Korea, Seoul St. Mary's Hospital
        • Contact:
      • A Coruña, Spain, 15006
        • Recruiting
        • Complexo Hospitalario Universitario A Coruña
        • Contact:
      • Alicante, Spain, 03010
        • Recruiting
        • Hospital General Universitario Dr Balmis
        • Contact:
      • Barcelona, Spain, 08036
        • Recruiting
        • Hospital Clinic de Barcelona
        • Contact:
      • Barcelona, Spain, 08041
        • Recruiting
        • Hospital de la Santa Creu i Sant Pau
        • Contact:
      • Córdoba, Spain, 14004
        • Recruiting
        • Hospital Universitario Reina Sofía
        • Contact:
      • Madrid, Spain, 28034
        • Recruiting
        • Hospital Universitario Ramon y Cajal
        • Contact:
      • Seville, Spain, 41009
        • Recruiting
        • Hospital Universitario Virgen De La Macarena
        • Contact:
    • Barcelona
      • Badalona, Barcelona, Spain, 08916
        • Recruiting
        • Hospital Universitari Germans Trias I Pujol
        • Contact:
      • Barcelona, Barcelona, Spain, 08907
        • Recruiting
        • Hospital Universitario de Bellvitge
        • Contact:
      • Terrassa, Barcelona, Spain, 08221
        • Recruiting
        • Hospital Universitario Mutua de Terrassa
        • Contact:
    • Guipúzcoa
    • Madrid
      • Madrid, Madrid, Spain, 28007
      • Madrid, Madrid, Spain, 28046
        • Recruiting
        • Hospital Universitario La Paz - UCICEC
        • Contact:
      • Majadahonda, Madrid, Spain, 28222
        • Recruiting
        • Hospital Universitario Puerta de Hierro Majadahonda
        • Contact:
    • Sevilla
      • Seville, Sevilla, Spain, 41014
        • Recruiting
        • Hospital Universitario Virgen Macarena
        • Contact:
    • Kaohsiung
      • Kaohsiung City, Kaohsiung, Taiwan, 80756
        • Recruiting
        • KMU Chung-Ho Memorial Hospital
        • Contact:
    • Taichung
      • Taichung, Taichung, Taiwan, 404327
        • Recruiting
        • China Medical University Hospital - Infectious
        • Contact:
    • Taoyuan
      • Taoyuan, Taoyuan, Taiwan, 333423
        • Recruiting
        • Chang Gung Medical Foundation - LinKou Chang Gung Memorial Hospital
        • Contact:
      • Bournemouth, United Kingdom, BH7 7DW
        • Withdrawn
        • The Royal Bournemouth Hospital
      • Bristol, United Kingdom, BS10 5NB
        • Recruiting
        • North Bristol NHS Trust - Southmead Hospital, Clinical Research Centre
        • Contact:
      • Edinburgh, United Kingdom, EH4 2XU
        • Recruiting
        • NHS Lothian - Western General Hospital
        • Contact:
      • London, United Kingdom, NW3 2QG
        • Recruiting
        • Royal Free London NHS Foundation Trust
        • Contact:
      • London, United Kingdom, SE1 7EH
        • Recruiting
        • St.Thomas' Hospital
        • Contact:
      • Sheffield, United Kingdom, S5 7AU
        • Recruiting
        • Northern General Hospital
        • Contact:
      • Swansea, United Kingdom, SA6 6NL
    • Devon
      • Exeter, Devon, United Kingdom, EX2 5DW
        • Withdrawn
        • Royal Devon University Healthcare NHS Trust
    • Alabama
      • Huntsville, Alabama, United States, 35801
    • Arizona
      • Chandler, Arizona, United States, 85224
        • Withdrawn
        • Advanced Gastroenterology, P.C.
      • Phoenix, Arizona, United States, 85054
        • Withdrawn
        • Mayo Clinic Hospital
      • Sun City, Arizona, United States, 85351
    • California
      • Apple Valley, California, United States, 92307
        • Withdrawn
        • Om Research, LLC
      • Culver City, California, United States, 90230
        • Recruiting
        • Science 37 Inc (Remote/Home option)
        • Contact:
      • Los Angeles, California, United States, 90027
        • Recruiting
        • Children's Hospital of Los Angeles
        • Contact:
      • San Diego, California, United States, 92161
        • Recruiting
        • VA San Diego Healthcare System
        • Contact:
      • San Dimas, California, United States, 91773
        • Withdrawn
        • North America Research Institute
      • Thousand Oaks, California, United States, 91360
      • Torrance, California, United States, 90502
        • Recruiting
        • Lundquist Institute for Biomedical Innovation at Harbor-UCLA Medical Center
        • Contact:
    • Connecticut
      • Bristol, Connecticut, United States, 06010
      • Hamden, Connecticut, United States, 06518
        • Recruiting
        • Medical Research Center of Connecticut
        • Contact:
      • Hartford, Connecticut, United States, 06102
        • Withdrawn
        • Hartford Hospital
    • Florida
      • Clearwater, Florida, United States, 33756
      • Fort Lauderdale, Florida, United States, 33308
        • Recruiting
        • Proactive Clinical Research, LLC
        • Contact:
      • Jacksonville, Florida, United States, 32256
        • Recruiting
        • Encore Borland-Groover Clinical Research
        • Contact:
      • Naples, Florida, United States, 34102
      • Port Orange, Florida, United States, 32127
        • Recruiting
        • Advanced Medical Research Center
        • Contact:
      • Saint Cloud, Florida, United States, 34769
      • Tampa, Florida, United States, 33614
        • Recruiting
        • International Center for Research
        • Contact:
      • Tampa, Florida, United States, 33612
        • Recruiting
        • James A. Haley Veterans' Hospital
        • Contact:
    • Georgia
      • Athens, Georgia, United States, 30607
      • Atlanta, Georgia, United States, 30308
      • Decatur, Georgia, United States, 30033
      • La Grange, Georgia, United States, 30240
        • Withdrawn
        • Regional Infectious Diseases and Infusion Center, Inc.
      • Marietta, Georgia, United States, 30060
        • Recruiting
        • Gastrointestinal Specialists of Georgia
        • Contact:
    • Idaho
      • Idaho Falls, Idaho, United States, 83404
        • Recruiting
        • Snake River Research, PLLC
        • Contact:
    • Illinois
      • Burr Ridge, Illinois, United States, 60527
      • Evanston, Illinois, United States, 60201
        • Withdrawn
        • NorthShore University Health System - Evanston Hospital
      • Gurnee, Illinois, United States, 60031
      • Island Lake, Illinois, United States, 60042
        • Withdrawn
        • Innovative Clinical Research Center, LLC (ICRC)
    • Indiana
      • Indianapolis, Indiana, United States, 46202
        • Recruiting
        • Indiana University Health University Hospital
        • Contact:
        • Contact:
      • New Albany, Indiana, United States, 47150
        • Recruiting
        • Gastroenterology Health Partners
        • Contact:
      • Newburgh, Indiana, United States, 47630
        • Withdrawn
        • Deaconess GI Specialty Center
    • Kansas
      • Kansas City, Kansas, United States, 66160
      • Wichita, Kansas, United States, 67211
        • Withdrawn
        • IDC Clinical Research, LLC
    • Kentucky
      • Louisville, Kentucky, United States, 40218
        • Recruiting
        • Gastroenterology Health Partners
        • Contact:
    • Louisiana
      • New Orleans, Louisiana, United States, 70121
        • Recruiting
        • Ochsner Clinic Foundation
        • Contact:
    • Maryland
      • Baltimore, Maryland, United States, 21287
        • Recruiting
        • Johns Hopkins Hospital
        • Contact:
        • Contact:
      • Chevy Chase, Maryland, United States, 20815
        • Recruiting
        • MGG Group Co., Inc., Chevy Chase Clinical Research
        • Contact:
    • Massachusetts
      • Boston, Massachusetts, United States, 02115
        • Recruiting
        • Brigham and Women's Hospital
        • Contact:
      • Boston, Massachusetts, United States, 02114
        • Recruiting
        • Massachusetts General Hospital
        • Contact:
      • Boston, Massachusetts, United States, 02111
        • Withdrawn
        • Tufts Medical Center
      • Newton, Massachusetts, United States, 02462
        • Withdrawn
        • Newton-Wellesley Hospital
    • Michigan
      • Ann Arbor, Michigan, United States, 48105
        • Recruiting
        • LTC Charles S. Kettles VA Medical Center
        • Contact:
      • Detroit, Michigan, United States, 48202
        • Recruiting
        • Henry Ford Health
        • Contact:
      • Royal Oak, Michigan, United States, 48073
    • Minnesota
      • Minneapolis, Minnesota, United States, 55455
        • Recruiting
        • University of Minnesota Medical Center
        • Contact:
      • Plymouth, Minnesota, United States, 55446
        • Withdrawn
        • MNGI Digestive Health, PA
      • Rochester, Minnesota, United States, 55905
    • Mississippi
      • Southaven, Mississippi, United States, 38671
        • Withdrawn
        • Delta Gastroenterology and Endoscopy Center
    • Missouri
      • Columbia, Missouri, United States, 65212
        • Withdrawn
        • University of Missouri
      • St Louis, Missouri, United States, 63110
        • Recruiting
        • Washington University School of Medicine
        • Contact:
      • Weldon Spring, Missouri, United States, 63304
    • New Jersey
      • New Brunswick, New Jersey, United States, 08901
        • Recruiting
        • Rutgers Robert Wood Johnson Medical School
        • Contact:
      • Somers Point, New Jersey, United States, 08244
    • New York
      • Manhasset, New York, United States, 11030
      • New York, New York, United States, 10021
        • Recruiting
        • New York Presbyterian Hospital
        • Contact:
      • New York, New York, United States, 10016
      • New York, New York, United States, 10279
        • Withdrawn
        • Manhattan Clinical Research, LLC
      • Syracuse, New York, United States, 13210
        • Terminated
        • Syracuse VA Medical Center
      • The Bronx, New York, United States, 10467
        • Terminated
        • Montefiore Medical Center
    • Ohio
      • Toledo, Ohio, United States, 43617
        • Withdrawn
        • Toledo Institute of Clinical Research
    • Oklahoma
      • Oklahoma City, Oklahoma, United States, 73104
        • Active, not recruiting
        • Oklahoma City Veterans Affairs Healthcare System
    • Pennsylvania
      • Harrisburg, Pennsylvania, United States, 17110
        • Recruiting
        • Susquehanna Research Group - Gastroenterology
        • Contact:
      • Philadelphia, Pennsylvania, United States, 19104
        • Recruiting
        • Children's Hospital of Philadelphia
        • Contact:
      • Sayre, Pennsylvania, United States, 18840
        • Withdrawn
        • Guthrie Medical Group, PC
      • Uniontown, Pennsylvania, United States, 15401
    • South Carolina
      • Charleston, South Carolina, United States, 29425
        • Recruiting
        • Medical University of South Carolina
        • Contact:
      • Charleston, South Carolina, United States, 29401
        • Withdrawn
        • Ralph H. Johnson VA Health Care System
      • Charleston, South Carolina, United States, 29414
        • Withdrawn
        • Lowcountry Infectious Diseases, P.A.
    • Tennessee
      • Cordova, Tennessee, United States, 38018
        • Recruiting
        • Gastro One Research
        • Contact:
      • Nashville, Tennessee, United States, 37232
        • Recruiting
        • Vanderbilt University Medical Center
        • Contact:
    • Texas
      • Cedar Park, Texas, United States, 78613
      • Dallas, Texas, United States, 75246
        • Recruiting
        • North Texas Infectious Disease Consultants, P.A.
        • Contact:
      • Houston, Texas, United States, 77204
        • Withdrawn
        • University of Houston College of Pharmacy
      • Katy, Texas, United States, 77494
        • Withdrawn
        • BioStar Clinical Research
      • Lubbock, Texas, United States, 79410
      • Sugar Land, Texas, United States, 77478
        • Withdrawn
        • Simcare Medical Research, LLC
    • Virginia
      • Richmond, Virginia, United States, 23229
    • Washington
      • Seattle, Washington, United States, 98101
      • Seattle, Washington, United States, 98101
        • Withdrawn
        • Seattle Infectious Disease Clinic
    • Wisconsin
      • Milwaukee, Wisconsin, United States, 53207
        • Recruiting
        • Wisconsin Center for Advanced Research
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Key Inclusion Criteria (For enrollment in Stage 1: recurrent CDI population):

  • Age ≥ 12 years where permitted, and ≥ 18 years in other locations, with a laboratory-confirmed qualifying episode of CDI and at least 1 prior occurrence within the last 6 months

Key Inclusion Criteria (For enrollment in Stage 2: primary CDI with high-risk for recurrence population):

  • Age ≥ 75 years with a laboratory-confirmed qualifying episode of CDI
  • OR age ≥ 12 years where permitted, and ≥ 18 years in other locations, with least two of the following risk factors:

    1. Age ≥ 65 years
    2. Kidney dysfunction, defined as estimated creatinine clearance < 60 mL/min/1.73 m^2 at the time of the qualifying CDI episode
    3. History of regular use of a proton pump inhibitor (PPI) within the past 2 months and expectation of continued use of PPIs throughout the study
    4. History of a prior CDI episode between 6 and 12 months prior to enrollment
    5. Immunosuppression due to an underlying disease or its treatment
    6. Has undergone solid organ or hematopoietic stem cell transplantation

Key Inclusion Criteria (For enrollment in Stage 1 or 2):

  • The qualifying episode of CDI must meet all the following criteria:

    1. New onset of ≥ 3 unformed bowel movements (ie, Types 5 to 7 on the Bristol stool scale) within 24 hours for 2 consecutive days
    2. CDI symptoms started within 4 weeks prior to initiation of standard of care (SoC) antibiotic therapy for CDI
    3. Stool sample collected before (or no later than 72 hours after) initiation of SoC antibiotic therapy that was positive in a CDI laboratory test, defined as enzyme immunoassay (EIA) for toxin A/B and glutamate dehydrogenase (GDH) with polymerase chain reaction (PCR) reflex testing for discordant EIA/GDH results, performed at either a local laboratory or the central laboratory
    4. Diarrhea considered unlikely to have another etiology
  • Prior to receiving any study medication, the participant should:

    1. Receive and complete a course of SoC antibiotic therapy for at least 10 days, up to a maximum of 28 days (Note: choice of agent is at the physician's discretion and antibiotic tapering is not allowed). It is permissible for decentralized participants to be randomized during SoC antibiotic administration.
    2. Meet the criterion of a successful clinical response, defined attaining symptomatic control of the qualifying CDI episode, ie, < 3 loose/unformed bowel movements per 24 hours for at least 2 consecutive days
  • Able to receive the first dose of study drug on the last planned day of SoC antibiotic administration for a qualifying CDI episode, or no later than 2 days after completion of antibiotic dosing
  • Recovered from any complications of severe or fulminant CDI and be clinically stable by the time of randomization

Key Exclusion Criteria (For both Stage 1 and Stage 2):

  • History of chronic diarrhea (defined as ≥ 3 loose stools per day lasting for at least 4 weeks) within 3 months prior to randomization that is not related to CDI
  • Known or suspected toxic megacolon or small bowel ileus at the time of randomization
  • History of confirmed celiac disease, inflammatory bowel disease, microscopic colitis, short gut, GI tract fistulas, or a recent episode (within 6 months of screening) of intestinal ischemia or ischemic colitis
  • Receipt of bezlotoxumab during the course of SoC antibiotic treatment for the qualifying CDI episode
  • Use of antidiarrheal drugs (eg, loperamide, diphenoxylate) within 3 days prior to the planned first dose of study drug
  • Anticipated administration of oral or parenteral antibacterial therapy for a non-CDI indication after randomization through Week 24 (end of study)
  • Probiotics, whether characterized as a dietary/food supplement, or a drug, are prohibited within 2 days before starting study drug and through the dosing period. (Note: consumption of food-based products such as yogurt, kombucha, and kefir are permitted.)
  • Absolute neutrophil count (ANC) of < 0.5 ×10^9 cells/L on 2 consecutive occasions within 7 days prior to randomization, or sustained ANC < 1.0 × 10^9 cells/L

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: VE303
Subjects assigned to the VE303 arm will take 3 capsules containing VE303 per day for 14 days after completing 10 to 21 days of standard of care antibiotic treatment for the qualifying CDI episode.
VE303 is a live biotherapeutic product (LBP) consisting of 8 clonally derived, nonpathogenic, nontoxigenic, commensal bacteria strains manufactured under Good Manufacturing Practices (GMP) conditions.
Placebo Comparator: Placebo
Subjects assigned to the placebo arm will take 3 placebo capsules per day for 14 days after completing 10 to 21 days of standard of care antibiotic treatment for the qualifying CDI episode.
Placebo capsules contain microcrystalline cellulose. Placebo capsules are visually identical to and not discernible from VE303 capsules. Placebo capsules will not contain any VE303 drug product.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
CDI Recurrence Rate at Week 8
Time Frame: 8 weeks
Proportion of participants with laboratory-confirmed CDI recurrence before or at Week 8.
8 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

May 20, 2024

Primary Completion (Estimated)

June 1, 2027

Study Completion (Estimated)

October 1, 2027

Study Registration Dates

First Submitted

January 23, 2024

First Submitted That Met QC Criteria

January 23, 2024

First Posted (Actual)

February 1, 2024

Study Record Updates

Last Update Posted (Actual)

May 18, 2026

Last Update Submitted That Met QC Criteria

May 13, 2026

Last Verified

October 1, 2025

More Information

Terms related to this study

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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