{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=COVID-19+Immunization&page=4",
    "query": {
      "condition": "COVID-19 Immunization",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 179,
    "total_pages": 18,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=COVID-19+Immunization&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=COVID-19+Immunization&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-04T06:35:35.741Z",
  "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": "NCT04728594",
      "title": "Emails Promoting COVID-19 Vaccination Among Healthcare Workers",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vaccination Refusal",
        "Communication"
      ],
      "interventions": [
        {
          "name": "Social Proof",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Reframing",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Scarcity Message",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Geisinger Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 9566,
      "start_date": "2021-01-15",
      "completion_date": "2021-01-20",
      "has_results": true,
      "last_update_posted_date": "2021-07-26",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "Danville, Pennsylvania",
      "locations": [
        {
          "city": "Danville",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04728594"
    },
    {
      "nct_id": "NCT05359250",
      "title": "Myocardial Injury and Dysfunction Associated With COVID-19 Vaccination",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Myocardial Injury",
        "COVID-19",
        "Vaccine Reaction"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Colorado, Denver",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 10,
      "start_date": "2021-05-12",
      "completion_date": "2024-12-30",
      "has_results": false,
      "last_update_posted_date": "2025-04-04",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "Aurora, Colorado",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05359250"
    },
    {
      "nct_id": "NCT05060991",
      "title": "Impact of Immunosuppression Adjustment on COVID-19 Vaccination Response in Kidney Transplant Recipients",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "COVID-19",
        "Immunosuppression",
        "Vaccine Response Impaired"
      ],
      "interventions": [
        {
          "name": "Reduction in antimetabolite immunosuppression",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of California, Davis",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 14,
      "start_date": "2021-09-24",
      "completion_date": "2026-12-24",
      "has_results": false,
      "last_update_posted_date": "2026-04-03",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "Sacramento, California",
      "locations": [
        {
          "city": "Sacramento",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05060991"
    },
    {
      "nct_id": "NCT06603090",
      "title": "Text4Vax: Text Message Reminders for Pediatric COVID-19 and Influenza Vaccines 2024-25 Season",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Influenza",
        "COVID-19",
        "Vaccination Hesitancy"
      ],
      "interventions": [
        {
          "name": "Text message influenza vaccine reminders",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Text message COVID-19 vaccine reminders",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Text message influenza and COVID-19 vaccine reminders",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Columbia University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "6 Months to 17 Years"
      },
      "enrollment_count": 66147,
      "start_date": "2024-10-02",
      "completion_date": "2025-04-30",
      "has_results": false,
      "last_update_posted_date": "2025-07-11",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 4,
      "location_summary": "Itasca, Illinois • New York, New York • Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Itasca",
          "state": "Illinois"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06603090"
    },
    {
      "nct_id": "NCT06128928",
      "title": "Connecting Friends and Health Workers to Boost COVID-19 Vaccination in Latino Communities",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "COVID-19",
        "Vaccine"
      ],
      "interventions": [
        {
          "name": "REDES",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Control",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Johns Hopkins University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 900,
      "start_date": "2023-07-08",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2025-11-12",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06128928"
    },
    {
      "nct_id": "NCT04837651",
      "title": "Humoral and T-Cell Responses to COVID-19 Vaccination in Multiple Sclerosis Patients Treated With Ocrelizumab Treated With Ocrelizumab or Natalizumab",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Multiple Sclerosis",
        "Demyelinating Autoimmune Diseases, CNS",
        "Autoimmune Diseases of the Nervous System",
        "Nervous System Diseases",
        "Demyelinating Diseases",
        "Autoimmune Diseases",
        "Immune System Diseases",
        "Pathologic Processes"
      ],
      "interventions": [
        {
          "name": "Elecsys semi-quantitative Anti-SARS-CoV-2 antibody test",
          "type": "DEVICE"
        },
        {
          "name": "T-Detect COVID T-cell blood test",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Dragonfly Research, LLC",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 48,
      "start_date": "2021-03-02",
      "completion_date": "2021-07-01",
      "has_results": false,
      "last_update_posted_date": "2021-08-02",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "Wellesley, Massachusetts",
      "locations": [
        {
          "city": "Wellesley",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04837651"
    },
    {
      "nct_id": "NCT04460703",
      "title": "COVID-19 Vaccine Messaging, Part 1",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Vaccination",
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "Control message",
          "type": "OTHER"
        },
        {
          "name": "Baseline message",
          "type": "OTHER"
        },
        {
          "name": "Personal freedom message",
          "type": "OTHER"
        },
        {
          "name": "Economic freedom message",
          "type": "OTHER"
        },
        {
          "name": "Self-interest message",
          "type": "OTHER"
        },
        {
          "name": "Community interest message",
          "type": "OTHER"
        },
        {
          "name": "Economic benefit message",
          "type": "OTHER"
        },
        {
          "name": "Guilt message",
          "type": "OTHER"
        },
        {
          "name": "Embarrassment message",
          "type": "OTHER"
        },
        {
          "name": "Anger message",
          "type": "OTHER"
        },
        {
          "name": "Trust in science message",
          "type": "OTHER"
        },
        {
          "name": "Not bravery message",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Yale University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 4000,
      "start_date": "2020-07-03",
      "completion_date": "2020-07-08",
      "has_results": false,
      "last_update_posted_date": "2022-05-05",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "New Haven, Connecticut",
      "locations": [
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04460703"
    },
    {
      "nct_id": "NCT05236270",
      "title": "CATCH-UP Vaccines: Engaged Approaches to Testing in Community/Healthcare Settings for the Underserved (COVID-19)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "COVID-19",
        "Vaccine Refusal"
      ],
      "interventions": [
        {
          "name": "Text Message",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Motivational Interviewing",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Electronic Educational Message with Tailored Questions/Prompts",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Oklahoma",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 312,
      "start_date": "2022-03-25",
      "completion_date": "2023-08-26",
      "has_results": true,
      "last_update_posted_date": "2024-05-22",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 1,
      "location_summary": "Oklahoma City, Oklahoma",
      "locations": [
        {
          "city": "Oklahoma City",
          "state": "Oklahoma"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05236270"
    },
    {
      "nct_id": "NCT05142332",
      "title": "PROmotion of COvid-19 VA(X)Ccination in the Emergency Department - PROCOVAXED",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Covid-19 Vaccine",
        "Vaccine Hesitancy"
      ],
      "interventions": [
        {
          "name": "Covid-19 vaccine education materials",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 541,
      "start_date": "2021-12-06",
      "completion_date": "2022-08-30",
      "has_results": true,
      "last_update_posted_date": "2023-12-13",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 7,
      "location_summary": "San Francisco, California • Durham, North Carolina • Philadelphia, Pennsylvania + 1 more",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05142332"
    },
    {
      "nct_id": "NCT06020118",
      "title": "Comparative Immunogenicity of Concomitant vs Sequential mRNA COVID-19 and Influenza Vaccinations",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Influenza",
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "Simultaneous Vaccination (Influenza Vaccine and mRNA COVID booster)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Sequential Vaccination (Influenza vaccine then mRNA COVID booster)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Sequential Vaccination (mRNA COVID booster then Influenza vaccine)",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "6 Years to 64 Years"
      },
      "enrollment_count": 455,
      "start_date": "2023-09-25",
      "completion_date": "2024-05-17",
      "has_results": true,
      "last_update_posted_date": "2025-06-13",
      "last_synced_at": "2026-10-04T06:35:35.741Z",
      "location_count": 8,
      "location_summary": "Phoenix, Arizona • Tempe, Arizona • Atlanta, Georgia + 4 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Tempe",
          "state": "Arizona"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Cleveland",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06020118"
    }
  ]
}