{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Pfizer+mRNA+COVID-19+vaccine&page=2",
    "query": {
      "intervention": "Pfizer mRNA COVID-19 vaccine",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 35,
    "total_pages": 4,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Pfizer+mRNA+COVID-19+vaccine&page=3&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Pfizer+mRNA+COVID-19+vaccine&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-08T05:26:34.978Z",
  "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": "2026-10-08T05:26:34.978Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04977479"
    },
    {
      "nct_id": "NCT04843774",
      "title": "Vaccine-generated Immunity in Ocrelizumab-treated Patients: Longitudinal Assessments (VIOLA)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Multiple Sclerosis"
      ],
      "interventions": [
        {
          "name": "SARS-COV-2 mRNA Vaccine",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "NYU Langone Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 64,
      "start_date": "2021-04-20",
      "completion_date": "2023-04-18",
      "has_results": false,
      "last_update_posted_date": "2023-11-08",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 2,
      "location_summary": "Denver, Colorado • New York, New York",
      "locations": [
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04843774"
    },
    {
      "nct_id": "NCT05321407",
      "title": "COVID-19 Vaccine Responses in PIDD Subjects",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "X-linked Agammaglobulinemia",
        "XLA",
        "Primary Immune Deficiency",
        "CVID",
        "Common Variable Immunodeficiency",
        "Primary Antibody Deficiencies",
        "Secondary Hypogammaglobulinemia"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "6 Months and older"
      },
      "enrollment_count": 100,
      "start_date": "2021-09-30",
      "completion_date": "2026-07-31",
      "has_results": false,
      "last_update_posted_date": "2025-06-03",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 3,
      "location_summary": "St. Petersburg, Florida • Chapel Hill, North Carolina • Durham, North Carolina",
      "locations": [
        {
          "city": "St. Petersburg",
          "state": "Florida"
        },
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05321407"
    },
    {
      "nct_id": "NCT04954287",
      "title": "Phase 1 Study of Intranasal PIV5 COVID-19 Vaccine Expressing SARS-CoV-2 Spike Protein in Healthy Adults and Adolescents",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Covid19"
      ],
      "interventions": [
        {
          "name": "CVXGA1 low dose",
          "type": "BIOLOGICAL"
        },
        {
          "name": "CVXGA1 high dose",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "CyanVac LLC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 72,
      "start_date": "2021-08-06",
      "completion_date": "2023-06-10",
      "has_results": false,
      "last_update_posted_date": "2024-02-07",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 4,
      "location_summary": "Bardstown, Kentucky • Rochester, New York • Cincinnati, Ohio + 1 more",
      "locations": [
        {
          "city": "Bardstown",
          "state": "Kentucky"
        },
        {
          "city": "Rochester",
          "state": "New York"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        },
        {
          "city": "Plano",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04954287"
    },
    {
      "nct_id": "NCT05077254",
      "title": "COVID Protection After Transplant-Immunosuppression Reduction",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Kidney Transplant Recipients",
        "Liver Transplant Recipients"
      ],
      "interventions": [
        {
          "name": "Pfizer-BioNTech COVID-19 Vaccine 2023-2024",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Moderna COVID-19 Vaccine 2023-2024",
          "type": "BIOLOGICAL"
        },
        {
          "name": "SOC IS Regimen",
          "type": "DRUG"
        },
        {
          "name": "SOC IS Reduction",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "DRUG"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 48,
      "start_date": "2021-12-06",
      "completion_date": "2025-02-21",
      "has_results": true,
      "last_update_posted_date": "2026-04-23",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 15,
      "location_summary": "San Diego, California • San Francisco, California • Atlanta, Georgia + 10 more",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Evanston",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05077254"
    },
    {
      "nct_id": "NCT04969250",
      "title": "Vaccination for Recovered Inpatients With COVID-19 (VATICO)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Covid19"
      ],
      "interventions": [
        {
          "name": "Moderna mRNA-1273 COVID-19 vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Pfizer BNT162b2 COVID-19 vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 66,
      "start_date": "2021-08-25",
      "completion_date": "2022-12-21",
      "has_results": true,
      "last_update_posted_date": "2024-03-27",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 16,
      "location_summary": "Los Angeles, California • San Francisco, California • Stanford, California + 11 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Stanford",
          "state": "California"
        },
        {
          "city": "Torrance",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04969250"
    },
    {
      "nct_id": "NCT04742569",
      "title": "Wearable Diagnostic for Detection of COVID-19 Infection",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "COVID-19"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "ClinOne, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 790,
      "start_date": "2020-12-21",
      "completion_date": "2022-01-15",
      "has_results": false,
      "last_update_posted_date": "2022-01-20",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 1,
      "location_summary": "Greenwood Village, Colorado",
      "locations": [
        {
          "city": "Greenwood Village",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04742569"
    },
    {
      "nct_id": "NCT04872738",
      "title": "Patient Experiences With the COVID-19 Vaccination After Breast Cancer Treatment",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer Related Lymphedema",
        "Covid19"
      ],
      "interventions": [
        {
          "name": "Survey",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Massachusetts General Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 714,
      "start_date": "2021-05-07",
      "completion_date": "2023-03-17",
      "has_results": true,
      "last_update_posted_date": "2026-01-06",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04872738"
    },
    {
      "nct_id": "NCT04969263",
      "title": "COVID-19 Protection After Transplant Pilot Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Kidney Transplant Recipients"
      ],
      "interventions": [
        {
          "name": "BNT162b2 vaccine (Pfizer/BioNTech)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "mRNA-1273 vaccine (Moderna)",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 81,
      "start_date": "2021-08-10",
      "completion_date": "2023-03-10",
      "has_results": true,
      "last_update_posted_date": "2025-07-30",
      "last_synced_at": "2026-10-08T05:26:34.978Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04969263"
    },
    {
      "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": "2026-10-08T05:26:34.978Z",
      "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"
    }
  ]
}