{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vaccine+placebo",
    "query": {
      "intervention": "Vaccine placebo"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 982,
    "total_pages": 99,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Vaccine+placebo&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-22T17:06:18.302Z",
  "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": "NCT00118924",
      "title": "Safety of and Immune Response to a Tick-Borne Encephalitis Vaccine (LGT(TP21)/DEN4) in Healthy Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Tick-Borne Encephalitis"
      ],
      "interventions": [
        {
          "name": "LGT(TP21)/DEN4",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 28,
      "start_date": "2005-07",
      "completion_date": "2007-07",
      "has_results": false,
      "last_update_posted_date": "2008-01-21",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 1,
      "location_summary": "Nashville, Tennessee",
      "locations": [
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00118924"
    },
    {
      "nct_id": "NCT00428337",
      "title": "Safety of and Immune Response to a DNA Vaccine and a Recombinant HIV-1-MVA Vaccine, Separately and in Combination, in Healthy Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "HIV Infections"
      ],
      "interventions": [
        {
          "name": "EP-1233",
          "type": "BIOLOGICAL"
        },
        {
          "name": "MVA-mBN32",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 36,
      "start_date": "2007-04",
      "completion_date": "2008-08",
      "has_results": false,
      "last_update_posted_date": "2021-10-14",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 3,
      "location_summary": "San Francisco, California • Rochester, New York • Nashville, Tennessee",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Rochester",
          "state": "New York"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00428337"
    },
    {
      "nct_id": "NCT04886154",
      "title": "A Study on the Safety, Effectiveness and Immune Response of Meningococcal Combined ABCWY Vaccine in Healthy Adolescents and Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Infections, Meningococcal"
      ],
      "interventions": [
        {
          "name": "MenABCWY-2Gen low dose vaccine",
          "type": "COMBINATION_PRODUCT"
        },
        {
          "name": "MenABCWY-2Gen high dose vaccine",
          "type": "COMBINATION_PRODUCT"
        },
        {
          "name": "Placebo",
          "type": "COMBINATION_PRODUCT"
        },
        {
          "name": "MenB vaccine",
          "type": "COMBINATION_PRODUCT"
        },
        {
          "name": "MenACWY vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "COMBINATION_PRODUCT",
        "BIOLOGICAL"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "10 Years to 50 Years"
      },
      "enrollment_count": 1440,
      "start_date": "2021-06-14",
      "completion_date": "2024-02-02",
      "has_results": true,
      "last_update_posted_date": "2025-05-31",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 12,
      "location_summary": "Colorado Springs, Colorado • Longmont, Colorado • Doral, Florida + 9 more",
      "locations": [
        {
          "city": "Colorado Springs",
          "state": "Colorado"
        },
        {
          "city": "Longmont",
          "state": "Colorado"
        },
        {
          "city": "Doral",
          "state": "Florida"
        },
        {
          "city": "Miami Lakes",
          "state": "Florida"
        },
        {
          "city": "Meridian",
          "state": "Idaho"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04886154"
    },
    {
      "nct_id": "NCT04754594",
      "title": "To Evaluate the Safety, Tolerability, and Immunogenicity of BNT162b2 Against COVID-19 in Healthy Pregnant Women 18 Years of Age and Older",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "SARS-CoV-2 Infection",
        "COVID-19",
        "Maternal Immunization"
      ],
      "interventions": [
        {
          "name": "BNT162b2",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "BioNTech SE",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 726,
      "start_date": "2021-02-16",
      "completion_date": "2022-07-15",
      "has_results": true,
      "last_update_posted_date": "2024-12-06",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 56,
      "location_summary": "Birmingham, Alabama • Mobile, Alabama • Glendale, Arizona + 28 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Glendale",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04754594"
    },
    {
      "nct_id": "NCT03583606",
      "title": "A Trial to Evaluate the Safety and Systems Biology Response of Ebolavirus Zaire Vaccine (ChAd3-EBO-Z)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Ebola Disease",
        "Immunisation"
      ],
      "interventions": [
        {
          "name": "ChAd3-EBO-Z",
          "type": "BIOLOGICAL"
        },
        {
          "name": "MVA Multi-Filo Ebola Vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 61,
      "start_date": "2018-11-12",
      "completion_date": "2020-01-14",
      "has_results": true,
      "last_update_posted_date": "2025-07-29",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03583606"
    },
    {
      "nct_id": "NCT06808776",
      "title": "Stories to Prevent (StoP) HPV Cancers",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Human Papillomavirus Vaccination",
        "Emotions"
      ],
      "interventions": [
        {
          "name": "Cancer survivor narrative",
          "type": "OTHER"
        },
        {
          "name": "Healthy eating tips",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Milton S. Hershey Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2025-11-18",
      "completion_date": "2027-03-31",
      "has_results": false,
      "last_update_posted_date": "2026-02-24",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 1,
      "location_summary": "Hershey, Pennsylvania",
      "locations": [
        {
          "city": "Hershey",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06808776"
    },
    {
      "nct_id": "NCT02021968",
      "title": "Evaluating the Safety and Effectiveness of a Dengue Virus Vaccine in Healthy Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Dengue"
      ],
      "interventions": [
        {
          "name": "TetraVax-DV-TV003",
          "type": "BIOLOGICAL"
        },
        {
          "name": "rDEN2∆30-7169",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 48,
      "start_date": "2013-11",
      "completion_date": "2015-12",
      "has_results": false,
      "last_update_posted_date": "2015-12-15",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 2,
      "location_summary": "Baltimore, Maryland • Burlington, Vermont",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Burlington",
          "state": "Vermont"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02021968"
    },
    {
      "nct_id": "NCT05842967",
      "title": "A Study to Assess the Safety, Tolerability, and Immunogenicity of RSVpreF in Adults at High Risk of Severe RSV Disease",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "RESPIRATORY SYNCYTIAL VIRUS (RSV)"
      ],
      "interventions": [
        {
          "name": "RSVpreF",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "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": 885,
      "start_date": "2023-05-11",
      "completion_date": "2024-03-18",
      "has_results": true,
      "last_update_posted_date": "2025-08-08",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 36,
      "location_summary": "Athens, Alabama • Birmingham, Alabama • Huntsville, Alabama + 28 more",
      "locations": [
        {
          "city": "Athens",
          "state": "Alabama"
        },
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05842967"
    },
    {
      "nct_id": "NCT01764256",
      "title": "A Phase 1 Dose Escalation Study to Examine the Safety of the P2-VP8 Rotavirus Vaccine",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Rotavirus Infection"
      ],
      "interventions": [
        {
          "name": "P2-VP8 subunit rotavirus vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "PATH",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 48,
      "start_date": "2012-12",
      "completion_date": "2013-09",
      "has_results": true,
      "last_update_posted_date": "2019-03-12",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01764256"
    },
    {
      "nct_id": "NCT02690207",
      "title": "Cross-vaccination Study of GSK Biologicals' Herpes Zoster Subunit (HZ/su) Vaccine (GSK 1437173A) in Subjects Who Previously Received Placebo in ZOSTER-006 (NCT01165177) and ZOSTER-022 (NCT01165229) Studies.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Herpes Zoster"
      ],
      "interventions": [
        {
          "name": "Herpes Zoster Vaccine GSK1437173A",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 8687,
      "start_date": "2016-03-16",
      "completion_date": "2019-03-15",
      "has_results": true,
      "last_update_posted_date": "2021-03-04",
      "last_synced_at": "2026-09-22T17:06:18.302Z",
      "location_count": 37,
      "location_summary": "Mesa, Arizona • Phoenix, Arizona • Tucson, Arizona + 31 more",
      "locations": [
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02690207"
    }
  ]
}