{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Pfizer-BioNTech+BNT162b2+COVID-19+Vaccinated",
    "query": {
      "intervention": "Pfizer-BioNTech BNT162b2 COVID-19 Vaccinated"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 5,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-10-02T16:17:15.077Z",
  "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": "NCT04834869",
      "title": "COVID-19 Vaccines Safety Tracking (CoVaST)",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Adverse Reaction to Vaccine",
        "COVID19 Vaccine"
      ],
      "interventions": [
        {
          "name": "BNT162b2",
          "type": "BIOLOGICAL"
        },
        {
          "name": "mRNA-1273",
          "type": "BIOLOGICAL"
        },
        {
          "name": "AZD1222",
          "type": "BIOLOGICAL"
        },
        {
          "name": "CoronaVac",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Sinopharm",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Gam-COVID-Vac",
          "type": "BIOLOGICAL"
        },
        {
          "name": "JNJ-78436735",
          "type": "BIOLOGICAL"
        },
        {
          "name": "CVnCoV",
          "type": "BIOLOGICAL"
        },
        {
          "name": "NVX-CoV2373",
          "type": "BIOLOGICAL"
        },
        {
          "name": "BBV152",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Masaryk University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 30000,
      "start_date": "2021-04-01",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2022-04-06",
      "last_synced_at": "2026-10-02T16:17:15.077Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04834869"
    },
    {
      "nct_id": "NCT04848584",
      "title": "Pfizer-BioNTech COVID-19 Vaccine Effectiveness Study - Kaiser Permanente Southern California",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "Primary Exposure Status of Pfizer-BioNTech COVID-19 Vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "BNT162b2 BA.4/5 bivalent",
          "type": "BIOLOGICAL"
        },
        {
          "name": "XBB.1.5-adapted vaccinated",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "0 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "0 Years and older"
      },
      "enrollment_count": 1,
      "start_date": "2021-05-15",
      "completion_date": "2025-04-30",
      "has_results": false,
      "last_update_posted_date": "2025-07-29",
      "last_synced_at": "2026-10-02T16:17:15.077Z",
      "location_count": 1,
      "location_summary": "Pasadena, California",
      "locations": [
        {
          "city": "Pasadena",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04848584"
    },
    {
      "nct_id": "NCT06703190",
      "title": "Estimated Vaccine Effectiveness and Durability of Pfizer/BioNTech 2024-2025 COVID-19 Vaccine",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "Pfizer-BioNTech BNT162b2 COVID-19 Vaccinated",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Not vaccinated with 2024-2025 formulated COVID-19 vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "5 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "5 Years and older"
      },
      "enrollment_count": 1,
      "start_date": "2024-11-25",
      "completion_date": "2025-06-06",
      "has_results": false,
      "last_update_posted_date": "2025-11-06",
      "last_synced_at": "2026-10-02T16:17:15.077Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06703190"
    },
    {
      "nct_id": "NCT05020145",
      "title": "COVID-19 Vaccination and Breakthrough Infections Among Persons With Immunocompromising Conditions in the United States",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Immunocompromised",
        "Immunosuppressed",
        "Covid-19",
        "SARS-COV-2",
        "SARS-COV-2 Infection",
        "Breakthrough Infection"
      ],
      "interventions": [
        {
          "name": "BNT162b2 (Tozinameran)",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 1277747,
      "start_date": "2021-08-25",
      "completion_date": "2021-12-17",
      "has_results": true,
      "last_update_posted_date": "2024-02-12",
      "last_synced_at": "2026-10-02T16:17:15.077Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05020145"
    },
    {
      "nct_id": "NCT05876377",
      "title": "Use and Effectiveness of COVID-19 Vaccines Using State Vaccine Registries and Insurance Claims Data",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "SARS-CoV-2",
        "COVID-19",
        "Post-Acute COVID-19 Syndrome"
      ],
      "interventions": [
        {
          "name": "Pfizer-BioNTech COVID-19 mRNA vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "6 Months and older"
      },
      "enrollment_count": 1,
      "start_date": "2023-10-23",
      "completion_date": "2026-05-31",
      "has_results": false,
      "last_update_posted_date": "2026-09-15",
      "last_synced_at": "2026-10-02T16:17:15.077Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05876377"
    }
  ]
}