{ "api_version": "1", "request": { "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Quadrivalent+influenza+vaccine+%28QIV%29", "query": { "intervention": "Quadrivalent influenza vaccine (QIV)" }, "page_size": 10 }, "pagination": { "page": 1, "page_size": 10, "total_count": 116, "total_pages": 12, "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Quadrivalent+influenza+vaccine+%28QIV%29&page=2&page_size=10", "previous_page_url": null }, "source": "remote", "last_synced_at": "2026-10-07T04:53:53.399Z", "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": "NCT03346772", "title": "Study of Immune Responses to Influenza Vaccination", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE4" ], "conditions": [ "Influenza Vaccination" ], "interventions": [ { "name": "Influenza vaccination", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "University of Pennsylvania", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 150, "start_date": "2017-10-20", "completion_date": "2026-07-01", "has_results": false, "last_update_posted_date": "2026-08-27", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 1, "location_summary": "Philadelphia, Pennsylvania", "locations": [ { "city": "Philadelphia", "state": "Pennsylvania" } ], "official_url": "https://clinicaltrials.gov/study/NCT03346772" }, { "nct_id": "NCT02434276", "title": "Study of the Immunogenicity and Safety of a Quadrivalent Influenza Vaccine (VAX2012Q) in Adults 18-64 Years", "overall_status": "UNKNOWN", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Influenza" ], "interventions": [ { "name": "VAX2012Q", "type": "BIOLOGICAL" }, { "name": "Fluzone Quadrivalent", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "VaxInnate Corporation", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": "64 Years", "sex": "ALL", "summary": "18 Years to 64 Years" }, "enrollment_count": 450, "start_date": "2015-05", "completion_date": "2016-06", "has_results": false, "last_update_posted_date": "2015-06-26", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 6, "location_summary": "Huntsville, Alabama • San Diego, California • Melbourne, Florida + 3 more", "locations": [ { "city": "Huntsville", "state": "Alabama" }, { "city": "San Diego", "state": "California" }, { "city": "Melbourne", "state": "Florida" }, { "city": "Peoria", "state": "Illinois" }, { "city": "Mishawaka", "state": "Indiana" } ], "official_url": "https://clinicaltrials.gov/study/NCT02434276" }, { "nct_id": "NCT02787044", "title": "INfluenza Vaccine to Effectively Stop Cardio Thoracic Events and Decompensated Heart Failure", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE4" ], "conditions": [ "Heart Failure", "Myocardial Infarction" ], "interventions": [ { "name": "High Dose Trivalent Influenza Vaccine", "type": "BIOLOGICAL" }, { "name": "Standard Dose Quadrivalent Influenza Vaccine", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Brigham and Women's Hospital", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 5388, "start_date": "2016-08-01", "completion_date": "2020-05-31", "has_results": true, "last_update_posted_date": "2022-01-21", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 127, "location_summary": "Birmingham, Alabama • Huntsville, Alabama • Anchorage, Alaska + 93 more", "locations": [ { "city": "Birmingham", "state": "Alabama" }, { "city": "Birmingham", "state": "Alabama" }, { "city": "Huntsville", "state": "Alabama" }, { "city": "Anchorage", "state": "Alaska" }, { "city": "Tucson", "state": "Arizona" } ], "official_url": "https://clinicaltrials.gov/study/NCT02787044" }, { "nct_id": "NCT02233816", "title": "Immunogenicity, Safety and Tolerability of a Plant-Derived Seasonal Virus-Like-Particle Quadrivalent Influenza Vaccine in Adults", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Virus Diseases", "RNA Virus Infections", "Respiratory Tract Diseases", "Respiratory Tract Infections" ], "interventions": [ { "name": "Low dose of quadrivalent VLP vaccine", "type": "BIOLOGICAL" }, { "name": "Medium dose of quadrivalent VLP vaccine", "type": "BIOLOGICAL" }, { "name": "High dose of quadrivalent VLP vaccine", "type": "BIOLOGICAL" }, { "name": "Placebo", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Medicago", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": "49 Years", "sex": "ALL", "summary": "18 Years to 49 Years" }, "enrollment_count": 300, "start_date": "2014-07-28", "completion_date": "2015-06-22", "has_results": false, "last_update_posted_date": "2019-11-13", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 2, "location_summary": "Hollywood, Florida • Miami, Florida", "locations": [ { "city": "Hollywood", "state": "Florida" }, { "city": "Miami", "state": "Florida" } ], "official_url": "https://clinicaltrials.gov/study/NCT02233816" }, { "nct_id": "NCT02539108", "title": "Safety and Immunogenicity of the 2015-2016 Formulation of Fluzone® Quadrivalent (Influenza Vaccine) Among Healthy Children", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE4" ], "conditions": [ "Influenza" ], "interventions": [ { "name": "Fluzone® Quadrivalent Influenza Vaccine, No Preservative", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Sanofi Pasteur, a Sanofi Company", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "6 Months", "maximum_age": "8 Years", "sex": "ALL", "summary": "6 Months to 8 Years" }, "enrollment_count": 60, "start_date": "2015-08", "completion_date": "2016-07", "has_results": true, "last_update_posted_date": "2016-11-29", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 2, "location_summary": "Bardstown, Kentucky • Salt Lake City, Utah", "locations": [ { "city": "Bardstown", "state": "Kentucky" }, { "city": "Salt Lake City", "state": "Utah" } ], "official_url": "https://clinicaltrials.gov/study/NCT02539108" }, { "nct_id": "NCT06431607", "title": "A Study to Find the Dose and Assess the Immune Response and Safety of a Vaccine Against Influenza in Healthy Younger and Older Adults", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Influenza, Human" ], "interventions": [ { "name": "F2G22B/DL001Z", "type": "BIOLOGICAL" }, { "name": "F2H23D/DL001Z-NH", "type": "BIOLOGICAL" }, { "name": "F2H23B/DL001Z-NH", "type": "BIOLOGICAL" }, { "name": "F2H23H/DL001Z", "type": "BIOLOGICAL" }, { "name": "FDQ23A-NH (Flu D-QIV)", "type": "COMBINATION_PRODUCT" }, { "name": "GSK5800544A", "type": "BIOLOGICAL" }, { "name": "Flu D-TIV", "type": "COMBINATION_PRODUCT" }, { "name": "F2H23A/DL001Z-NH", "type": "BIOLOGICAL" }, { "name": "F2H23G/DL001Z", "type": "BIOLOGICAL" }, { "name": "Fluzone HD Quadrivalent", "type": "COMBINATION_PRODUCT" }, { "name": "Fluzone HD", "type": "COMBINATION_PRODUCT" } ], "intervention_types": [ "BIOLOGICAL", "COMBINATION_PRODUCT" ], "sponsor": "GlaxoSmithKline", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": "85 Years", "sex": "ALL", "summary": "18 Years to 85 Years" }, "enrollment_count": 845, "start_date": "2024-05-23", "completion_date": "2025-06-04", "has_results": true, "last_update_posted_date": "2026-03-10", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 18, "location_summary": "Hialeah, Florida • Miami, Florida • Chicago, Illinois + 14 more", "locations": [ { "city": "Hialeah", "state": "Florida" }, { "city": "Miami", "state": "Florida" }, { "city": "Miami", "state": "Florida" }, { "city": "Chicago", "state": "Illinois" }, { "city": "Valparaiso", "state": "Indiana" } ], "official_url": "https://clinicaltrials.gov/study/NCT06431607" }, { "nct_id": "NCT03301051", "title": "Efficacy, Safety, and Immunogenicity of a Plant-Derived Quadrivalent Virus-Like Particles (VLPs) Influenza Vaccine in Adults", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Virus Diseases", "RNA Virus Infections", "Respiratory Tract Diseases", "Respiratory Tract Infections", "Influenza" ], "interventions": [ { "name": "Quadrivalent VLP Vaccine", "type": "BIOLOGICAL" }, { "name": "Placebo", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Medicago", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": "64 Years", "sex": "ALL", "summary": "18 Years to 64 Years" }, "enrollment_count": 10160, "start_date": "2017-08-31", "completion_date": "2018-05-09", "has_results": true, "last_update_posted_date": "2023-08-14", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 29, "location_summary": "Mobile, Alabama • Anaheim, California • Milford, Connecticut + 23 more", "locations": [ { "city": "Mobile", "state": "Alabama" }, { "city": "Anaheim", "state": "California" }, { "city": "Milford", "state": "Connecticut" }, { "city": "Coral Gables", "state": "Florida" }, { "city": "Hollywood", "state": "Florida" } ], "official_url": "https://clinicaltrials.gov/study/NCT03301051" }, { "nct_id": "NCT06503900", "title": "Simultaneous mRNA COVID-19 and IIV Vaccination in Pregnancy Study", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE4" ], "conditions": [ "Birth Outcomes", "Safety", "Adverse Event Following Immunization" ], "interventions": [ { "name": "mRNA COVID-19 vaccine", "type": "BIOLOGICAL" }, { "name": "IIV4 (quadrivalent inactivated influenza vaccine)", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Duke University", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "FEMALE", "summary": "18 Years and older · Female only" }, "enrollment_count": 98, "start_date": "2024-09-12", "completion_date": "2025-11-19", "has_results": false, "last_update_posted_date": "2026-01-15", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 6, "location_summary": "Atlanta, Georgia • Boston, Massachusetts • Durham, North Carolina + 2 more", "locations": [ { "city": "Atlanta", "state": "Georgia" }, { "city": "Atlanta", "state": "Georgia" }, { "city": "Boston", "state": "Massachusetts" }, { "city": "Durham", "state": "North Carolina" }, { "city": "Winston-Salem", "state": "North Carolina" } ], "official_url": "https://clinicaltrials.gov/study/NCT06503900" }, { "nct_id": "NCT05858450", "title": "This Study Intends to Describe the Characteristics of Patients Given the Pfizer-BioNTech Bivalent mRNA COVID-19 Vaccine and Any Commercially Available Influenza Vaccines at the Same Time Versus at Different Times.", "overall_status": "COMPLETED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Influenza, Human", "COVID-19" ], "interventions": [ { "name": "Comirnaty", "type": "BIOLOGICAL" }, { "name": "Quadrivalent Influenza Vaccine", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Pfizer", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": null, "sex": "ALL", "summary": "18 Years and older" }, "enrollment_count": 3442996, "start_date": "2023-05-05", "completion_date": "2023-05-12", "has_results": true, "last_update_posted_date": "2024-09-20", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 1, "location_summary": "New York, New York", "locations": [ { "city": "New York", "state": "New York" } ], "official_url": "https://clinicaltrials.gov/study/NCT05858450" }, { "nct_id": "NCT02545543", "title": "A Study to Evaluate the Immunogenicity and Safety of Seqirus Quadrivalent Influenza Vaccine (QIV) in a Pediatric Population 5 Through 17 Years of Age", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Influenza, Human" ], "interventions": [ { "name": "Seqirus QIV", "type": "BIOLOGICAL" }, { "name": "Comparator QIV", "type": "BIOLOGICAL" } ], "intervention_types": [ "BIOLOGICAL" ], "sponsor": "Seqirus", "sponsor_class": "INDUSTRY", "healthy_volunteers": true, "eligibility": { "minimum_age": "5 Years", "maximum_age": "17 Years", "sex": "ALL", "summary": "5 Years to 17 Years" }, "enrollment_count": 2278, "start_date": "2015-09", "completion_date": "2016-06", "has_results": true, "last_update_posted_date": "2018-05-23", "last_synced_at": "2026-10-07T04:53:53.399Z", "location_count": 32, "location_summary": "Huntsville, Alabama • Madera, California • Ontario, California + 29 more", "locations": [ { "city": "Huntsville", "state": "Alabama" }, { "city": "Madera", "state": "California" }, { "city": "Ontario", "state": "California" }, { "city": "Redding", "state": "California" }, { "city": "Sacramento", "state": "California" } ], "official_url": "https://clinicaltrials.gov/study/NCT02545543" } ] }