{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Text+message+COVID-19+vaccine+reminders",
    "query": {
      "intervention": "Text message COVID-19 vaccine reminders"
    },
    "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": "2026-09-28T20:59:30.714Z",
  "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": "NCT04904744",
      "title": "Effect of Varied Outreach Methods on Appointment Scheduling, Appointment Completion, and Receipt of COVID-19 Vaccination",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Health Care Utilization",
        "Vaccine Preventable Disease"
      ],
      "interventions": [
        {
          "name": "Low tailored message",
          "type": "OTHER"
        },
        {
          "name": "No message",
          "type": "OTHER"
        },
        {
          "name": "Low tailored message plus COVID-19 vaccine message",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Children's Hospital Medical Center, Cincinnati",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "12 Years to 17 Years"
      },
      "enrollment_count": 1235,
      "start_date": "2021-05-28",
      "completion_date": "2021-12-10",
      "has_results": true,
      "last_update_posted_date": "2024-10-28",
      "last_synced_at": "2026-09-28T20:59:30.714Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04904744"
    },
    {
      "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": "2026-09-28T20:59:30.714Z",
      "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": "NCT06119854",
      "title": "Brief Digital Intervention to Increase COVID-19 Vaccination Among Individuals With Anxiety or Depression",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Misinformation",
        "Vaccine Hesitancy",
        "Anxiety",
        "Depression",
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "Attitudinal inoculation",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Cognitive-behavioral therapy-informed intervention",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Conventional public health messaging",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "City University of New York, School of Public Health",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1419,
      "start_date": "2024-04-15",
      "completion_date": "2024-11-15",
      "has_results": true,
      "last_update_posted_date": "2025-09-11",
      "last_synced_at": "2026-09-28T20:59:30.714Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06119854"
    },
    {
      "nct_id": "NCT04565353",
      "title": "Testing Multiple Behavioral Science Strategies to Increase Flu-Shot Rates",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Influenza, Human"
      ],
      "interventions": [
        {
          "name": "Flu shot text messages",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "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": 74811,
      "start_date": "2020-09-20",
      "completion_date": "2021-03-31",
      "has_results": true,
      "last_update_posted_date": "2022-02-01",
      "last_synced_at": "2026-09-28T20:59:30.714Z",
      "location_count": 2,
      "location_summary": "Danville, Pennsylvania • Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Danville",
          "state": "Pennsylvania"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04565353"
    },
    {
      "nct_id": "NCT04801524",
      "title": "Text-based Reminders to Promote COVID-19 Vaccinations",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Covid19, Vaccines"
      ],
      "interventions": [
        {
          "name": "Self-benefit",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Prosocial-benefit",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Early access",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Fresh start",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of California, Los Angeles",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 250000,
      "start_date": "2021-02-07",
      "completion_date": "2022-01-01",
      "has_results": false,
      "last_update_posted_date": "2022-09-13",
      "last_synced_at": "2026-09-28T20:59:30.714Z",
      "location_count": 1,
      "location_summary": "Westwood, Los Angeles, California",
      "locations": [
        {
          "city": "Westwood, Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04801524"
    }
  ]
}