{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?sponsor=Seqirus",
    "query": {
      "sponsor": "Seqirus"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 31,
    "total_pages": 4,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?sponsor=Seqirus&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-25T01:05:05.562Z",
  "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": "NCT00958126",
      "title": "A Clinical Trial of CSL's 2009 H1N1 Influenza Vaccine (CSL425) in Healthy Adults in the USA",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Influenza"
      ],
      "interventions": [
        {
          "name": "CSL425",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1313,
      "start_date": "2009-08",
      "completion_date": "2010-04",
      "has_results": true,
      "last_update_posted_date": "2017-11-21",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 11,
      "location_summary": "Huntsville, Alabama • San Diego, California • Melbourne, Florida + 8 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Melbourne",
          "state": "Florida"
        },
        {
          "city": "Peoria",
          "state": "Illinois"
        },
        {
          "city": "South Bend",
          "state": "Indiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00958126"
    },
    {
      "nct_id": "NCT01964989",
      "title": "Clinical Study to Evaluate the Safety, Immunogenicity and Efficacy of Investigational Flu Vaccine Compared to Approved Flu Vaccine in Children.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Influenza Virus"
      ],
      "interventions": [
        {
          "name": "Adjuvanted Quadrivalent Subunit Influenza Virus Vaccine (aQIV)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Non-adjuvanted Trivalent Influenza Vaccine (TIV) / Quadrivalent Influenza Vaccine (QIV)",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "71 Months",
        "sex": "ALL",
        "summary": "6 Months to 71 Months"
      },
      "enrollment_count": 10644,
      "start_date": "2013-11",
      "completion_date": "2016-08",
      "has_results": true,
      "last_update_posted_date": "2023-03-27",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 91,
      "location_summary": "Chandler, Arizona • Harrisburg, Arkansas • Anaheim, California + 70 more",
      "locations": [
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Harrisburg",
          "state": "Arkansas"
        },
        {
          "city": "Anaheim",
          "state": "California"
        },
        {
          "city": "Anaheim",
          "state": "California"
        },
        {
          "city": "Baldwin Park",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01964989"
    },
    {
      "nct_id": "NCT05501561",
      "title": "Safety and Immunogenicity of Different Formulations of an MF59-Adjuvanted Influenza Vaccine in Older Adults ≥50 Years of Age",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Influenza, Human"
      ],
      "interventions": [
        {
          "name": "Experimental: IIV-A Investigational IIV-A administered as a single dose intramuscularly on Day 1",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Experimental: aIIV-B Investigational aIIV-B administered as a single dose intramuscularly on Day 1",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Experimental: aIIV-C Investigational aIIV-C administered as a single dose intramuscularly on Day 1",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Active Comparator: Licensed IIV IIV administered as a single dose intramuscularly on Day 1",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "50 Years and older"
      },
      "enrollment_count": 1056,
      "start_date": "2022-08-25",
      "completion_date": "2023-03-31",
      "has_results": true,
      "last_update_posted_date": "2026-06-30",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 47,
      "location_summary": "Tempe, Arizona • Huntington Beach, California • San Diego, California + 42 more",
      "locations": [
        {
          "city": "Tempe",
          "state": "Arizona"
        },
        {
          "city": "Huntington Beach",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Colorado Springs",
          "state": "Colorado"
        },
        {
          "city": "Milford",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05501561"
    },
    {
      "nct_id": "NCT02933723",
      "title": "Immunogenicity of Influenza Vaccine in Long Term Care",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Influenza"
      ],
      "interventions": [
        {
          "name": "Blood Draw",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Insight Therapeutics, LLC",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2016-10",
      "completion_date": "2021-09-01",
      "has_results": false,
      "last_update_posted_date": "2021-03-09",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 1,
      "location_summary": "Cleveland, Ohio",
      "locations": [
        {
          "city": "Cleveland",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02933723"
    },
    {
      "nct_id": "NCT00812019",
      "title": "Dose Ranging Study to Evaluate Immunogenicity and Safety of Adjuvanted or Non-adjuvanted Cell Culture-derived H5N1 Influenza Vaccine in Young Adults (18-40 Years Old)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Influenza"
      ],
      "interventions": [
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 3.75_0%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 3.75_25%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 3.75_50%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 3.75_100%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 7.5_0%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 7.5_25%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 7.5_50%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 7.5_100%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 15_0%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 15_25%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 15_50%MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Cell Culture-Derived H5N1 Subunit Influenza Vaccine, 15_100%MF59",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 753,
      "start_date": "2008-11",
      "completion_date": "2010-11",
      "has_results": false,
      "last_update_posted_date": "2020-08-24",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00812019"
    },
    {
      "nct_id": "NCT00958243",
      "title": "A Clinical Trial of CSL's 2009 H1N1 Influenza Vaccine (CSL425) in a Healthy Pediatric Population in the USA",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Influenza"
      ],
      "interventions": [
        {
          "name": "CSL's 2009 H1N1 Influenza Vaccine (CSL425)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "9 Years",
        "sex": "ALL",
        "summary": "6 Months to 9 Years"
      },
      "enrollment_count": 473,
      "start_date": "2009-08",
      "completion_date": "2010-04",
      "has_results": true,
      "last_update_posted_date": "2018-05-23",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 13,
      "location_summary": "Chandler, Arizona • Melbourne, Florida • Bardstown, Kentucky + 10 more",
      "locations": [
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Melbourne",
          "state": "Florida"
        },
        {
          "city": "Bardstown",
          "state": "Kentucky"
        },
        {
          "city": "Metairie",
          "state": "Louisiana"
        },
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00958243"
    },
    {
      "nct_id": "NCT05875961",
      "title": "Study to Evaluate Immunogenicity, Safety and Tolerability of Adjuvanted and Non-Adjuvanted H2N3 Influenza Vaccines in Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Influenza, Human",
        "Infections",
        "Respiratory Tract Infections",
        "Virus Diseases",
        "Infection Viral"
      ],
      "interventions": [
        {
          "name": "Low dose A/H2N3c + standard dose MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Intermediate dose A/H2N3c + standard dose MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "High dose A/H2N3c + standard dose MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "High dose A/H2N3c non-adjuvanted",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Lowest dose A/H2N3c + high dose MF59",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Low dose A/H2N3c + high dose MF59",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 600,
      "start_date": "2023-06-15",
      "completion_date": "2024-11-15",
      "has_results": false,
      "last_update_posted_date": "2026-09-21",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 3,
      "location_summary": "Rockville, Maryland • Lincoln, Nebraska • Omaha, Nebraska",
      "locations": [
        {
          "city": "Rockville",
          "state": "Maryland"
        },
        {
          "city": "Lincoln",
          "state": "Nebraska"
        },
        {
          "city": "Omaha",
          "state": "Nebraska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05875961"
    },
    {
      "nct_id": "NCT05044195",
      "title": "A Clinical Study to Evaluate the Immunogenicity and Safety of an Adjuvanted Quadrivalent Influenza Vaccine Compared With a Licensed Quadrivalent Vaccine in Adults 50 to 64 Years of Age",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Influenza, Human"
      ],
      "interventions": [
        {
          "name": "aQIV",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Comparator QIV",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "50 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "50 Years to 64 Years"
      },
      "enrollment_count": 2044,
      "start_date": "2021-09-30",
      "completion_date": "2022-09-09",
      "has_results": true,
      "last_update_posted_date": "2023-09-28",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 12,
      "location_summary": "Mobile, Alabama • Tempe, Arizona • Atlantis, Florida + 9 more",
      "locations": [
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Tempe",
          "state": "Arizona"
        },
        {
          "city": "Atlantis",
          "state": "Florida"
        },
        {
          "city": "Orlando",
          "state": "Florida"
        },
        {
          "city": "Savannah",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05044195"
    },
    {
      "nct_id": "NCT02914275",
      "title": "A Study to Evaluate the Immunogenicity and Safety of Seqirus Quadrivalent Influenza Vaccine (QIV) in a Pediatric Population 6 Months Through 59 Months of Age.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Influenza, Human"
      ],
      "interventions": [
        {
          "name": "Seqirus Quadrivalent Inactivated Influenza Vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Comparator Quadrivalent Inactivated Influenza Vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "59 Months",
        "sex": "ALL",
        "summary": "6 Months to 59 Months"
      },
      "enrollment_count": 2250,
      "start_date": "2016-09-27",
      "completion_date": "2017-08-11",
      "has_results": true,
      "last_update_posted_date": "2019-01-23",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 39,
      "location_summary": "Birmingham, Alabama • Mobile, Alabama • Anaheim, California + 27 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Anaheim",
          "state": "California"
        },
        {
          "city": "Anaheim",
          "state": "California"
        },
        {
          "city": "Downey",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02914275"
    },
    {
      "nct_id": "NCT04074928",
      "title": "Safety and Immunogenicity Study of QIVc in Healthy Pediatric Subjects",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Influenza",
        "Human",
        "Virus Diseases"
      ],
      "interventions": [
        {
          "name": "QIVc",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Comparator QIV",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Months",
        "maximum_age": "47 Months",
        "sex": "ALL",
        "summary": "6 Months to 47 Months"
      },
      "enrollment_count": 2414,
      "start_date": "2019-09-06",
      "completion_date": "2020-09-03",
      "has_results": true,
      "last_update_posted_date": "2022-01-12",
      "last_synced_at": "2026-09-25T01:05:05.562Z",
      "location_count": 47,
      "location_summary": "Mobile, Alabama • Anaheim, California • Downey, California + 37 more",
      "locations": [
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Anaheim",
          "state": "California"
        },
        {
          "city": "Downey",
          "state": "California"
        },
        {
          "city": "Ontario",
          "state": "California"
        },
        {
          "city": "Paramount",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04074928"
    }
  ]
}