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Showing 1–24 of 33 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Fecal swab collection Clear all
Recruiting No phase listed Observational Accepts healthy volunteers

Healthy Volunteers Study

NCT06962059
View directory record Official record
Conditions
Ovarian Cancer, Genetic Predisposition to Disease
Interventions
Self-Administered Sample Collection
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
30 Years to 50 Years · Female only
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2027
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 4, 2026 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational

Oral Aromatase Inhibitors Modify the Gut Microbiome

NCT05030038
View directory record Official record
Conditions
Breast Cancer
Interventions
Fecal swab collection, Blood samples
Biological
Lead sponsor
Wake Forest University Health Sciences
Other
Eligibility
18 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2025
U.S. locations
1
States / cities
Winston-Salem, North Carolina
Source: ClinicalTrials.gov public record
Updated Jun 14, 2026 · Synced Sep 23, 2026, 2:18 PM EDT
Not listed No phase listed Observational Accepts healthy volunteers

Establishing a Diagnostic and Therapeutic Index in Autism Spectrum Disorder (ASD) and Fragile X Syndrome

NCT04869930
View directory record Official record
Conditions
Autism Spectrum Disorder, Fra(X) Syndrome
Interventions
specimen collection
Other
Lead sponsor
Nova Mentis Life Science Corp
Industry
Eligibility
6 Months to 21 Years
Enrollment
300 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Fort Lauderdale, Florida
Source: ClinicalTrials.gov public record
Updated Oct 12, 2021 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Coxsackie Virus in Pregnancy and Congenital Heart Disease

NCT03737006
View directory record Official record
Conditions
Congenital Heart Disease in Pregnancy
Interventions
Not listed
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
122 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Aug 3, 2022 · Synced Sep 23, 2026, 2:18 PM EDT
Completed Phase 2 Interventional Results available

Niclosamide for Mild to Moderate COVID-19

NCT04399356
View directory record Official record
Conditions
COVID-19
Interventions
Niclosamide, Placebo, Telehealth monitoring
Drug · Other
Lead sponsor
Tufts Medical Center
Other
Eligibility
18 Years and older
Enrollment
73 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 11, 2022 · Synced Sep 23, 2026, 2:18 PM EDT
Recruiting No phase listed Observational

Norris ORIEN Total Cancer Care

NCT02970045
View directory record Official record
Conditions
Cancer Risk, Malignant Neoplasm
Interventions
Biospecimen Collection, Evaluation of Cancer Risk Factors, Medical Chart Review, Quality-of-Life Assessment, Questionnaire Administration
Procedure · Other
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older
Enrollment
10,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2037
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Apr 28, 2026 · Synced Sep 23, 2026, 2:18 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Does a Periaqueductal Gray-vagus Nerve Interface Malfunction Explain the Nat hx With Its Numerous Co-morbidities?

NCT06616363
View directory record Official record
Conditions
POTS - Postural Orthostatic Tachycardia Syndrome
Interventions
Questionnaires to be competed, Provide list of medication and lifetime events, Use phone App to record new life events, Will wear an activity monitor, Periodic 24-hour urine sodium check, A fMRI scan, A bedside tilt test will be performed, IV placed to collect blood samples, Stool Sample
Behavioral · Device · Other + 1 more
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
12 Years to 21 Years · Female only
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
1
States / cities
Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Sep 25, 2025 · Synced Sep 23, 2026, 2:18 PM EDT
Active, not recruiting Phase 2 Interventional Results available

Aspirin in Preventing Colorectal Cancer in Patients With Colorectal Adenoma

NCT02965703
View directory record Official record
Conditions
Colorectal Adenoma, Colorectal Carcinoma
Interventions
Aspirin, Biospecimen Collection, Placebo Administration, Questionnaire Administration, Rectal Biopsy
Drug · Procedure · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
81 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2026
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Aug 5, 2026 · Synced Sep 23, 2026, 2:18 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

InAdvance: Surveillance, Prevention, and Interception in a Population at Risk for Cancer

NCT05463796
View directory record Official record
Conditions
Cancer Risk, Cancer Predisposition Syndrome, Hereditary Cancer Prediction, Childhood Cancer Survivors, Adult Cancer Survivors, IARC Carcinogens, Smoking History, Lung Cancer, Ductal/Lobular Carcinoma, Barrett Esophagus, Pancreatic Precursor Lesions, Colonic Dysplasia/Adenomata, Non-Alcoholic Fatty Liver Disease, Non Alcoholic Steatohepatitis, Cirrhosis, High Grade Prostatic Epithelial Neoplasia, High-grade Bladder Urothelial Dysplasia/Carcinoma in Situ, Adenomatous Hyperplasia, High-risk Oral Precancerous Diseases, Melanocytic Lesion, Adult, Hematologic Malignancy, Lung; Node, Serous Tubal Intraepithelial Carcinoma, Endometrial Intraepithelial Neoplasia, Cervical and Endocervical Carcinoma in Situ, Vulvar Intraepithelial Neoplasia, Nephrogenic Rests, Benign Bone Lesions With Risk of Malignant Degeneration, Giant Cell Tumor, Osteochondroma, Spitz Nevus
Interventions
Samples
Other
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
Not listed
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2031
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 16, 2026 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The BEACH Interview Study- Pregnant and Breastfeeding Mothers

NCT03036696
View directory record Official record
Conditions
Pediatric Obesity, Recruitment
Interventions
Pregnant Mothers Interview, Breastfeeding Mothers Interview
Other
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
59 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2019
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Aug 11, 2019 · Synced Sep 23, 2026, 2:18 PM EDT
Terminated Phase 1 Interventional

FMT for MDRO Colonization After Infection in Renal Transplant Recipients

NCT02922816
View directory record Official record
Conditions
Infection Due to Resistant Organism
Interventions
Fecal Microbiota Transplant (FMT), Bowel preparation, Stool or perirectal swab sampling, Fasting
Biological · Procedure · Other
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2021
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Nov 14, 2023 · Synced Sep 23, 2026, 2:18 PM EDT
Completed Phase 1 Interventional

FMT for Postop Crohn's Disease

NCT05248191
View directory record Official record
Conditions
Crohn Disease
Interventions
Capsule fecal microbiota material (cap-FMT), Colonoscopic fecal microbiota material (colo-FMT)
Biological
Lead sponsor
University of Minnesota
Other
Eligibility
18 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2024
U.S. locations
1
States / cities
Minneapolis, Minnesota
Source: ClinicalTrials.gov public record
Updated Dec 16, 2025 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational

A Study of Immune Responses to the Virus That Causes COVID-19

NCT04431414
View directory record Official record
Conditions
SARS-CoV-2, COVID-19
Interventions
Sample collection
Other
Lead sponsor
COVID-19 Prevention Network
Network
Eligibility
18 Years and older
Enrollment
953 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
15
States / cities
Birmingham, Alabama • San Francisco, California • Miami, Florida + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 25, 2022 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational

Microbiome in Lung Cancer and Other Malignancies

NCT03688347
View directory record Official record
Conditions
Lung Cancer, Cancer, Malignancy
Interventions
Nasal Swab, Oral Swab, Stool Collection, Microbiome analysis, DNA Banking, Skin Swab
Procedure · Other · Genetic
Lead sponsor
Taher Abu Hejleh
Other
Eligibility
18 Years to 100 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
1
States / cities
Iowa City, Iowa
Source: ClinicalTrials.gov public record
Updated May 10, 2022 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational

Study Assessing Risk Factors for Abdominal Pain in Children With Inflammatory Bowel Disease

NCT02984059
View directory record Official record
Conditions
Inflammatory Bowel Disease
Interventions
Genomic DNA, RNA analysis, Microbiome, Calprotectin, Pain questionnaires, Anxiety/Depression Questionnaires
Genetic · Other
Lead sponsor
Connecticut Children's Medical Center
Other
Eligibility
8 Years to 18 Years
Enrollment
126 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2018
U.S. locations
1
States / cities
Hartford, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 7, 2019 · Synced Sep 23, 2026, 2:18 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Black Raspberry Nectar for the Prevention of Lung Cancer, BE WELL Study

NCT04267874
View directory record Official record
Conditions
Lung Carcinoma, Tobacco-Related Carcinoma
Interventions
Biospecimen Collection, Nutritional Supplementation, Placebo Administration, Questionnaire Administration
Procedure · Dietary Supplement · Drug + 1 more
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
55 Years to 77 Years
Enrollment
96 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Nov 30, 2023 · Synced Sep 23, 2026, 2:18 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Human Skin and Gut Mycobiome and Bacteriome Comprehensive Registry

NCT05196061
View directory record Official record
Conditions
Healthy Volunteers
Interventions
Questionnaire, Stool sample, Skin swab, Oral rinse
Other
Lead sponsor
University Hospitals Cleveland Medical Center
Other
Eligibility
18 Years and older
Enrollment
5,000 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2030
U.S. locations
1
States / cities
Cleveland, Ohio
Source: ClinicalTrials.gov public record
Updated Apr 12, 2026 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Pediatric Obesity and the Infant Microbiome (BEACH)

NCT02843087
View directory record Official record
Conditions
Pediatric Obesity
Interventions
Not listed
Lead sponsor
University of Florida
Other
Eligibility
18 Years to 45 Years · Female only
Enrollment
83 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2024
U.S. locations
1
States / cities
Gainesville, Florida
Source: ClinicalTrials.gov public record
Updated Sep 24, 2024 · Synced Sep 23, 2026, 2:18 PM EDT
Enrolling by invitation No phase listed Observational

Physiologic and Functional Adaptations of Insulin Sensitive Tissues

NCT03407833
View directory record Official record
Conditions
Diabetes, Insulin Resistance, Obesity, Bariatric Surgery Candidate, Roux-en-y Gastric Bypass, Liver Diseases
Interventions
Endoscopy biopsy, Surgical biopsy, Mixed-meal tolerance test, Excised Liver Tissue Sampling
Other
Lead sponsor
Vanderbilt University Medical Center
Other
Eligibility
18 Years and older
Enrollment
500 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2028
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 17, 2025 · Synced Sep 23, 2026, 2:18 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Tissue Repository: CTCL Collection Protocol

NCT02840747
View directory record Official record
Conditions
Lymphoma, T-Cell, Cutaneous, Lymphomatoid Papulosis, Sézary Syndrome
Interventions
Not listed
Lead sponsor
Columbia University
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2026
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 3, 2025 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

The Human Microbiome in Immune-Mediated Diseases

NCT02394964
View directory record Official record
Conditions
Autoimmune
Interventions
Sample Collection
Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
75 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2023
U.S. locations
2
States / cities
New Haven, Connecticut • New York, New York
Source: ClinicalTrials.gov public record
Updated Dec 20, 2023 · Synced Sep 23, 2026, 2:18 PM EDT
Terminated No phase listed Observational

Characterization Of the Intestinal Microbiome Evolution After Kidney Transplant Donation or Receipt

NCT03043339
View directory record Official record
Conditions
Renal Transplant
Interventions
Stool Specimen Collection, Anal Swab Sampling, Short Diet Assessment (SDA), NHANES Dietary Screener Questionnaire (DSQ)
Other
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
2
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 25, 2024 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Gut Microbiota Composition in Hispanic and Non-Hispanic Children.

NCT03990350
View directory record Official record
Conditions
Obesity
Interventions
Fecal Sample Collection, Physical Activity Questionnaire, Food Frequency Questionnaire, 24-hour dietary recall diary
Other
Lead sponsor
Nemours Children's Clinic
Other
Eligibility
6 Years to 12 Years
Enrollment
17 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2020
U.S. locations
1
States / cities
Wilmington, Delaware
Source: ClinicalTrials.gov public record
Updated Jun 29, 2020 · Synced Sep 23, 2026, 2:18 PM EDT
Completed No phase listed Observational

Immuno-Oncology Database and Bioregistry

NCT04656873
View directory record Official record
Conditions
Malignancy, Immune System Diseases, Autoimmune Diseases
Interventions
Biospecimen Collection, Medical Chart Review, Questionnaires/Surveys
Procedure · Other
Lead sponsor
UNC Lineberger Comprehensive Cancer Center
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
1
States / cities
Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 7, 2026 · Synced Sep 23, 2026, 2:18 PM EDT