{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Covid-19%2B+observational&page=3",
    "query": {
      "intervention": "Covid-19+ observational",
      "page": 3
    },
    "page_size": 10
  },
  "pagination": {
    "page": 3,
    "page_size": 10,
    "total_count": 110,
    "total_pages": 11,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Covid-19%2B+observational&page=4&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Covid-19%2B+observational&page=2&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-06T07:47:08.129Z",
  "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": "NCT04958889",
      "title": "COVID-19 Recovery Study: Symptoms and Biomarkers of Long COVID-19 in People Living With and Without HIV",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV2)",
        "HIV"
      ],
      "interventions": [
        {
          "name": "No intervention",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "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": 392,
      "start_date": "2021-06-11",
      "completion_date": "2024-03-31",
      "has_results": false,
      "last_update_posted_date": "2024-04-04",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04958889"
    },
    {
      "nct_id": "NCT04387656",
      "title": "NCI COVID-19 in Cancer Patients, NCCAPS Study",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "COVID-19 Infection",
        "Hematopoietic and Lymphatic System Neoplasm",
        "Malignant Solid Neoplasm",
        "Metastatic Malignant Solid Neoplasm"
      ],
      "interventions": [
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Data Collection",
          "type": "OTHER"
        },
        {
          "name": "Quality-of-Life Assessment",
          "type": "OTHER"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "OTHER"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1877,
      "start_date": "2020-06-05",
      "completion_date": "2026-10-03",
      "has_results": false,
      "last_update_posted_date": "2026-10-01",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 928,
      "location_summary": "Birmingham, Alabama • Mobile, Alabama • Anchorage, Alaska + 589 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04387656"
    },
    {
      "nct_id": "NCT04652505",
      "title": "Effect of the COVID-19 Public Health Crisis on the Mental Health and Physical Well-Being of Cancer Patients, the Coping With COVID Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "COVID-19 Infection",
        "Hematopoietic and Lymphoid Cell Neoplasm",
        "Malignant Solid Neoplasm"
      ],
      "interventions": [
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 80,
      "start_date": "2020-07-13",
      "completion_date": "2022-01-12",
      "has_results": false,
      "last_update_posted_date": "2022-01-14",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04652505"
    },
    {
      "nct_id": "NCT05042193",
      "title": "A Prospective Virtual Study to Evaluate the Longevity of IgG Antibodies in Individuals Exposed to COVID-19",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "SARS-CoV-2 Acute Respiratory Disease"
      ],
      "interventions": [
        {
          "name": "SARS-CoV-2",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Everly Health",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1883,
      "start_date": "2021-03-19",
      "completion_date": "2022-06-14",
      "has_results": false,
      "last_update_posted_date": "2022-06-15",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 1,
      "location_summary": "Austin, Texas",
      "locations": [
        {
          "city": "Austin",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05042193"
    },
    {
      "nct_id": "NCT04548895",
      "title": "Non-invasive Biometric Monitoring in Nursing Homes to Fight COVID-19",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Covid19",
        "Community-Acquired Respiratory Tract Infection"
      ],
      "interventions": [
        {
          "name": "Observational measurement of biometric data. No change to health care provided.",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Health Stream Analytics, LLC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 26,
      "start_date": "2020-12-30",
      "completion_date": "2021-06-09",
      "has_results": false,
      "last_update_posted_date": "2021-06-11",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 1,
      "location_summary": "Pasco, Washington",
      "locations": [
        {
          "city": "Pasco",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04548895"
    },
    {
      "nct_id": "NCT05004181",
      "title": "Safety and Immunogenicity of RNA-based Vaccines Against SARS-CoV-2 Variants in Healthy Participants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "SARS-CoV-2 Infection",
        "COVID-19",
        "SARS-CoV-2 Acute Respiratory Disease",
        "SARS (Disease)"
      ],
      "interventions": [
        {
          "name": "BNT162b2",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Multivalent BNT162b2 (B.1.1.7 + B.1.617.2)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Monovalent BNT162b2 (B.1.1.7)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Monovalent BNT162b2 (B.1.617.2)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Monovalent BNT162b2 (B.1.1.529.1)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Observational",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "BioNTech SE",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "18 Years to 85 Years"
      },
      "enrollment_count": 1380,
      "start_date": "2021-08-25",
      "completion_date": "2023-10-04",
      "has_results": true,
      "last_update_posted_date": "2024-11-22",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 14,
      "location_summary": "Long Beach, California • San Diego, California • Milford, Connecticut + 10 more",
      "locations": [
        {
          "city": "Long Beach",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Milford",
          "state": "Connecticut"
        },
        {
          "city": "Stamford",
          "state": "Connecticut"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05004181"
    },
    {
      "nct_id": "NCT05139992",
      "title": "COVID-19 Vaccine Response in Sickle Cell Disease",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Sickle Cell Disease",
        "COVID-19"
      ],
      "interventions": [
        {
          "name": "COVID-19 Vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "ASH Research Collaborative",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 59,
      "start_date": "2021-12-01",
      "completion_date": "2023-12-31",
      "has_results": true,
      "last_update_posted_date": "2025-02-14",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 8,
      "location_summary": "Oakland, California • Washington D.C., District of Columbia • Baltimore, Maryland + 5 more",
      "locations": [
        {
          "city": "Oakland",
          "state": "California"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "The Bronx",
          "state": "New York"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05139992"
    },
    {
      "nct_id": "NCT04366986",
      "title": "International Registry of Coronavirus (COVID-19) Exposure in Pregnancy",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Covid-19"
      ],
      "interventions": [
        {
          "name": "Tested for SARS-CoV-2 (regardless of the result)",
          "type": "OTHER"
        },
        {
          "name": "Clinical diagnosis of COVID-19 by a health care professional",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Pregistry",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 17318,
      "start_date": "2020-06-23",
      "completion_date": "2021-08-31",
      "has_results": false,
      "last_update_posted_date": "2021-09-28",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04366986"
    },
    {
      "nct_id": "NCT04892797",
      "title": "Understanding Immunology and Patient Outcomes of COVID-19 in Hospitalized Patients",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Covid19"
      ],
      "interventions": [
        {
          "name": "Covid-19+ observational",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Vermont",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 16,
      "start_date": "2021-02-03",
      "completion_date": "2023-06-30",
      "has_results": false,
      "last_update_posted_date": "2025-05-14",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 1,
      "location_summary": "Burlington, Vermont",
      "locations": [
        {
          "city": "Burlington",
          "state": "Vermont"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04892797"
    },
    {
      "nct_id": "NCT04847596",
      "title": "A Multicenter Study to Assess Response to COVID-19 Vaccine in Multiple Sclerosis Participants Treated With Ofatumumab",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Relapsing Multiple Sclerosis"
      ],
      "interventions": [
        {
          "name": "Ofatumumab",
          "type": "OTHER"
        },
        {
          "name": "Covid-19 vaccine",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 25,
      "start_date": "2021-05-21",
      "completion_date": "2022-02-18",
      "has_results": false,
      "last_update_posted_date": "2023-01-25",
      "last_synced_at": "2026-10-06T07:47:08.129Z",
      "location_count": 4,
      "location_summary": "Phoenix, Arizona • Owosso, Michigan • St Louis, Missouri + 1 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Owosso",
          "state": "Michigan"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Plainview",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04847596"
    }
  ]
}