{ "api_version": "1", "request": { "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Pfizer+Booster+Vaccine", "query": { "intervention": "Pfizer Booster Vaccine" }, "page_size": 10 }, "pagination": { "page": 1, "page_size": 10, "total_count": 19, "total_pages": 2, "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Pfizer+Booster+Vaccine&page=2&page_size=10", "previous_page_url": null }, "source": "remote", "last_synced_at": "2026-09-09T19:46:35.788Z", "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.", "notes": [ "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.", "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.", "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees." ], "trials": [ { "nct_id": "NCT04977479", "title": "The Safety of Administering a Second Dose of a COVID-19 mRNA Vaccine in Individuals Who Experienced a Systemic Allergic Reaction to an Initial Dose", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Systemic Allergic Reaction" ], "interventions": [ { "name": "Pfizer-BioNTech COVID-19 Vaccine (Comirnaty)", "type": "BIOLOGICAL" }, { "name": "Placebo", "type": "OTHER" }, { "name": "Pfizer-BioNTech COVID-19 Vaccine, Bivalent", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL", "OTHER" ], "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)", "sponsor_class": "NIH", "healthy_volunteers": false, "eligibility": { "minimum_age": "16 Years", "maximum_age": "69 Years", "sex": "ALL", "summary": "16 Years to 69 Years" }, "enrollment_count": 20, "start_date": "2021-09-08", "completion_date": "2023-02-22", "has_results": true, "last_update_posted_date": "2023-10-16", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 1, "location_summary": "Bethesda, Maryland", "locations": [ { "city": "Bethesda", "state": "Maryland" } ], "official_url": "https://clinicaltrials.gov/study/NCT04977479" }, { "nct_id": "NCT05197621", "title": "The Impact of COVID-19 on Maternal and Neonatal Outcomes", "overall_status": "RECRUITING", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "COVID-19", "Pregnancy; Infection" ], "interventions": [ { "name": "mRNA COVID-19 vaccine (Pfizer or Moderna)", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Johns Hopkins University", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "14 Years", "maximum_age": "55 Years", "sex": "FEMALE", "summary": "14 Years to 55 Years · Female only" }, "enrollment_count": 300, "start_date": "2020-04-13", "completion_date": "2028-05-05", "has_results": false, "last_update_posted_date": "2026-05-11", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 1, "location_summary": "Baltimore, Maryland", "locations": [ { "city": "Baltimore", "state": "Maryland" } ], "official_url": "https://clinicaltrials.gov/study/NCT05197621" }, { "nct_id": "NCT05279365", "title": "PROSPECTIVE OPEN LABEL CLINICAL TRIAL TO ADMINISTER A BOOSTER DOSE OF PFIZER/BIONTECH OR MODERNA COVID-19 VACCINE IN HIGH-RISK INDIVIDUALS", "overall_status": "UNKNOWN", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2", "PHASE3" ], "conditions": [ "SARS CoV 2 Infection", "COVID-19" ], "interventions": [ { "name": "Pfizer/BioNTech (BNT162b2)", "type": "BIOLOGICAL" }, { "name": "Moderna", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "DHR Health Institute for Research and Development", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 1000, "start_date": "2021-07-30", "completion_date": "2023-08-31", "has_results": false, "last_update_posted_date": "2022-03-29", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 4, "location_summary": "Brownsville, Texas • Edinburg, Texas • Rio Grande City, Texas", "locations": [ { "city": "Brownsville", "state": "Texas" }, { "city": "Edinburg", "state": "Texas" }, { "city": "Edinburg", "state": "Texas" }, { "city": "Rio Grande City", "state": "Texas" } ], "official_url": "https://clinicaltrials.gov/study/NCT05279365" }, { "nct_id": "NCT05000216", "title": "COVID-19 Booster Vaccine in Autoimmune Disease Non-Responders", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Rheumatoid Arthritis (RA)", "Systemic Lupus Erythematosus (SLE)", "Pemphigus Vulgaris", "Multiple Sclerosis (MS)", "Systemic Sclerosis (SSc)", "Pediatric SLE", "Juvenile Idiopathic Arthritis (JIA)", "Juvenile Dermatomyositis (JDM)", "Pediatric-Onset Multiple Sclerosis (POMS)" ], "interventions": [ { "name": "Moderna mRNA-1273", "type": "BIOLOGICAL" }, { "name": "BNT162b2", "type": "BIOLOGICAL" }, { "name": "Ad26.COV2.S", "type": "BIOLOGICAL" }, { "name": "Continue IS (MMF or MPA)", "type": "DRUG" }, { "name": "Continue IS (MTX)", "type": "DRUG" }, { "name": "Continue IS (B cell depletion therapy)", "type": "BIOLOGICAL" }, { "name": "Monovalent [B.1.351] CoV2 preS dTM-AS03", "type": "BIOLOGICAL" }, { "name": "Withhold IS (MMF or MPA)", "type": "DRUG" }, { "name": "Withhold IS (MTX)", "type": "DRUG" }, { "name": "Withhold IS (B cell depletion therapy)", "type": "DRUG" }, { "name": "Moderna mRNA-1273, Bivalent", "type": "BIOLOGICAL" }, { "name": "BNT162b2, Bivalent", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL", "DRUG" ], "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)", "sponsor_class": "NIH", "healthy_volunteers": false, "eligibility": { "minimum_age": "2 Years", "maximum_age": null, "sex": "ALL", "summary": "2 Years and older" }, "enrollment_count": 258, "start_date": "2021-08-13", "completion_date": "2024-03-28", "has_results": true, "last_update_posted_date": "2026-06-10", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 29, "location_summary": "Los Angeles, California • New Haven, Connecticut • Atlanta, Georgia + 18 more", "locations": [ { "city": "Los Angeles", "state": "California" }, { "city": "New Haven", "state": "Connecticut" }, { "city": "Atlanta", "state": "Georgia" }, { "city": "Indianapolis", "state": "Indiana" }, { "city": "Boston", "state": "Massachusetts" } ], "official_url": "https://clinicaltrials.gov/study/NCT05000216" }, { "nct_id": "NCT04878211", "title": "A Open-label Study to Assess Response to COVID-19 Vaccine in Multiple Sclerosis Participants Treated With Ofatumumab", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE4" ], "conditions": [ "Relapsing Multiple Sclerosis (RMS)" ], "interventions": [ { "name": "Ofatumumab", "type": "DRUG" }, { "name": "mRNA COVID-19 vaccine", "type": "BIOLOGICAL" }, { "name": "interferon or glatiramer acetate", "type": "DRUG" } ], "intervention_types": [ "DRUG", "BIOLOGICAL" ], "sponsor": "Novartis Pharmaceuticals", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": "55 Years", "sex": "ALL", "summary": "18 Years to 55 Years" }, "enrollment_count": 24, "start_date": "2021-06-10", "completion_date": "2023-04-14", "has_results": true, "last_update_posted_date": "2025-05-16", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 7, "location_summary": "Phoenix, Arizona • Hollywood, Florida • Wellesley, Massachusetts + 4 more", "locations": [ { "city": "Phoenix", "state": "Arizona" }, { "city": "Hollywood", "state": "Florida" }, { "city": "Wellesley", "state": "Massachusetts" }, { "city": "Plymouth", "state": "Minnesota" }, { "city": "St Louis", "state": "Missouri" } ], "official_url": "https://clinicaltrials.gov/study/NCT04878211" }, { "nct_id": "NCT05220397", "title": "Janssen Ad26.CoV2.S Vaccine Booster in Kidney Transplant Recipients", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Kidney Transplant Recipient" ], "interventions": [ { "name": "Janssen Ad26.CoV2.S Vaccine", "type": "BIOLOGICAL" }, { "name": "Reduction in Immunosuppression Medication", "type": "OTHER" }, { "name": "Maintenance in Immunosuppression Medication", "type": "OTHER" } ], "intervention_types": [ "BIOLOGICAL", "OTHER" ], "sponsor": "Mark Stegall", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 468, "start_date": "2022-04-11", "completion_date": "2025-02-28", "has_results": true, "last_update_posted_date": "2025-09-15", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 3, "location_summary": "Phoenix, Arizona • Jacksonville, Florida • Rochester, Minnesota", "locations": [ { "city": "Phoenix", "state": "Arizona" }, { "city": "Jacksonville", "state": "Florida" }, { "city": "Rochester", "state": "Minnesota" } ], "official_url": "https://clinicaltrials.gov/study/NCT05220397" }, { "nct_id": "NCT05765578", "title": "An Observational Study of Moderna COVID-19 Bivalent Vaccines (Original and Omicron BA.4/BA.5) and 2023 Updated mRNA COVID-19 Vaccines (XBB.1.5)", "overall_status": "COMPLETED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "COVID-19" ], "interventions": [ { "name": "Moderna COVID-19 Vaccine", "type": "BIOLOGICAL" }, { "name": "Moderna mRNA1273.222 Booster", "type": "BIOLOGICAL" }, { "name": "Pfizer COVID-19 Vaccine", "type": "BIOLOGICAL" }, { "name": "Moderna 2023 Updated COVID-19 vaccine (XBB.1.5)", "type": "BIOLOGICAL" }, { "name": "Pfizer 2023 Updated COVID-19 vaccine (XBB.1.5)", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "ModernaTX, Inc.", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 1713, "start_date": "2023-03-08", "completion_date": "2024-06-17", "has_results": false, "last_update_posted_date": "2024-07-31", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 1, "location_summary": "Culver City, California", "locations": [ { "city": "Culver City", "state": "California" } ], "official_url": "https://clinicaltrials.gov/study/NCT05765578" }, { "nct_id": "NCT04936997", "title": "Immune Response to the COVID-19 Vaccine", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "EARLY_PHASE1" ], "conditions": [ "Covid19", "Cancer", "Malignancy", "Vaccine Response Impaired" ], "interventions": [ { "name": "SARS-COV2 Pfizer Vaccine", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "University of Arizona", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 20, "start_date": "2021-06-07", "completion_date": "2022-05-08", "has_results": false, "last_update_posted_date": "2022-05-20", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 1, "location_summary": "Tucson, Arizona", "locations": [ { "city": "Tucson", "state": "Arizona" } ], "official_url": "https://clinicaltrials.gov/study/NCT04936997" }, { "nct_id": "NCT06672055", "title": "A Study to Evaluate VXA-CoV2-3.3 COVID-19 Vaccine Against Currently Approved/Authorized mRNA COVID-19 Injectable Booster Vaccine in Adults Previously Immunized Against COVID-19 Infection", "overall_status": "ACTIVE_NOT_RECRUITING", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "SARS-CoV2", "COVID-19" ], "interventions": [ { "name": "VXA-CoV2-3.1", "type": "BIOLOGICAL" }, { "name": "COMIRNATY®", "type": "BIOLOGICAL" }, { "name": "VXA-CoV2-3.3", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Vaxart", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 5485, "start_date": "2024-10-08", "completion_date": "2027-05", "has_results": false, "last_update_posted_date": "2026-06-25", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 145, "location_summary": "Anniston, Alabama • Birmingham, Alabama • Mobile, Alabama + 126 more", "locations": [ { "city": "Anniston", "state": "Alabama" }, { "city": "Birmingham", "state": "Alabama" }, { "city": "Mobile", "state": "Alabama" }, { "city": "Glendale", "state": "Arizona" }, { "city": "Mesa", "state": "Arizona" } ], "official_url": "https://clinicaltrials.gov/study/NCT06672055" }, { "nct_id": "NCT05367908", "title": "A Study to Determine Antibody Levels After Receiving COVID-19 Boosters of Any Kind", "overall_status": "COMPLETED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "SARS-CoV-2" ], "interventions": [], "intervention_types": [], "sponsor": "ModernaTX, Inc.", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 1501, "start_date": "2022-04-11", "completion_date": "2022-08-14", "has_results": false, "last_update_posted_date": "2022-10-13", "last_synced_at": "2026-09-09T19:46:35.788Z", "location_count": 1, "location_summary": "San Mateo, California", "locations": [ { "city": "San Mateo", "state": "California" } ], "official_url": "https://clinicaltrials.gov/study/NCT05367908" } ] }