{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Diphtheria&page=2",
    "query": {
      "condition": "Diphtheria",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Diphtheria&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-05-22T09:47:16.742Z",
  "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": "NCT00254995",
      "title": "Descriptive, Post-marketing, Surveillance Safety Study of Menactra Vaccine",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Meningitis",
        "Meningococcal Disease"
      ],
      "interventions": [
        {
          "name": "None administered in this study",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Sanofi Pasteur, a Sanofi Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 62626,
      "start_date": "2005-07",
      "completion_date": "2013-05",
      "has_results": true,
      "last_update_posted_date": "2016-04-19",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 1,
      "location_summary": "Oakland, California",
      "locations": [
        {
          "city": "Oakland",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00254995"
    },
    {
      "nct_id": "NCT00489970",
      "title": "Persistence Study of GSK Biologicals' Tdap Vaccine 1, 3, 5 and 9 Years Following Administration as an Initial Single Dose in Healthy Young Adults and to Evaluate the Immunogenicity and Safety of Boostrix as a Second Dose of Tdap, When Administered at Year 9",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Acellular Pertussis",
        "Tetanus",
        "Diphtheria"
      ],
      "interventions": [
        {
          "name": "Taking of blood samples",
          "type": "PROCEDURE"
        },
        {
          "name": "Boostrix",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Adacel",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "BIOLOGICAL"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "28 Years",
        "maximum_age": "73 Years",
        "sex": "ALL",
        "summary": "28 Years to 73 Years"
      },
      "enrollment_count": 1954,
      "start_date": "2007-06-01",
      "completion_date": "2016-03-01",
      "has_results": true,
      "last_update_posted_date": "2020-05-01",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 37,
      "location_summary": "Huntsville, Alabama • Chandler, Arizona • Mesa, Arizona + 31 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00489970"
    },
    {
      "nct_id": "NCT04766086",
      "title": "Trial to Evaluate the Safety, Tolerability, and Immunogenicity of A Multivalent Group B Streptococcus Vaccine When Administered Concomitantly With Tdap in Healthy Nonpregnant Women",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Group B Streptococcus Infections"
      ],
      "interventions": [
        {
          "name": "Multivalent Group B streptococcus vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Tetanus, diphtheria, and acellular pertussis vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "49 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 49 Years · Female only"
      },
      "enrollment_count": 306,
      "start_date": "2022-08-12",
      "completion_date": "2023-04-27",
      "has_results": true,
      "last_update_posted_date": "2024-05-24",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 12,
      "location_summary": "Newton, Kansas • Omaha, Nebraska • Las Vegas, Nevada + 8 more",
      "locations": [
        {
          "city": "Newton",
          "state": "Kansas"
        },
        {
          "city": "Omaha",
          "state": "Nebraska"
        },
        {
          "city": "Las Vegas",
          "state": "Nevada"
        },
        {
          "city": "Raleigh",
          "state": "North Carolina"
        },
        {
          "city": "Wilmington",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04766086"
    },
    {
      "nct_id": "NCT00700635",
      "title": "Dose Comparison Study of Menactra® in US Children",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Meningitis",
        "Meningococcal Infection",
        "Neisseria Meningitidis"
      ],
      "interventions": [
        {
          "name": "Menactra®: Meningococcal Polysaccharide Diphtheria Conjugate",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Sanofi Pasteur, a Sanofi Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "2 Years",
        "maximum_age": "10 Years",
        "sex": "ALL",
        "summary": "2 Years to 10 Years"
      },
      "enrollment_count": 333,
      "start_date": "2008-06",
      "completion_date": "2009-10",
      "has_results": true,
      "last_update_posted_date": "2016-04-14",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 15,
      "location_summary": "Jonesboro, Arkansas • Little Rock, Arkansas • Boca Raton, Florida + 12 more",
      "locations": [
        {
          "city": "Jonesboro",
          "state": "Arkansas"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Boca Raton",
          "state": "Florida"
        },
        {
          "city": "Viera",
          "state": "Florida"
        },
        {
          "city": "Woburn",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00700635"
    },
    {
      "nct_id": "NCT00346073",
      "title": "Safety and Immunogenicity of GSK's Tdap Vaccine (Boostrix) in Adults Aged 19 to 64 Years",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Acellular Pertussis",
        "Diphtheria",
        "Tetanus"
      ],
      "interventions": [
        {
          "name": "Boostrix™",
          "type": "BIOLOGICAL"
        },
        {
          "name": "ADACEL®",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "19 Years to 64 Years"
      },
      "enrollment_count": 2337,
      "start_date": "2006-07-13",
      "completion_date": "2007-03-07",
      "has_results": true,
      "last_update_posted_date": "2018-08-07",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 42,
      "location_summary": "Huntsville, Alabama • Chandler, Arizona • Mesa, Arizona + 36 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Mesa",
          "state": "Arizona"
        },
        {
          "city": "Peoria",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00346073"
    },
    {
      "nct_id": "NCT04398706",
      "title": "Study of a Pneumococcal Conjugate Vaccine When Administered Concomitantly With Routine Pediatric Vaccines in Healthy Toddlers and Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Pneumococcal Immunisation",
        "Diphtheria Immunisation",
        "Tetanus Immunisation",
        "Pertussis Immunisation",
        "Hepatitis B Immunisation",
        "Haemophilus Influenzae Type b Immunisation",
        "Polio Immunisation",
        "Measles Immunisation",
        "Rubella Immunisation",
        "Varicella Immunisation",
        "Mumps Immunisation"
      ],
      "interventions": [
        {
          "name": "Pneumococcal Conjugate Vaccine formulation 1",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Pneumococcal Conjugate Vaccine formulation 2",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Pneumococcal Conjugate Vaccine formulation 3",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Varicella Virus Vaccine Live",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Measles, Mumps, and Rubella Virus Vaccine Live",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Pneumococcal 13-valent Conjugate Vaccine [Diphtheria CRM197 Protein]",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Diphtheria and Tetanus Toxoids and Acellular Pertussis Adsorbed, Inactivated Poliovirus and Haemophilus b Conjugate (Tetanus Toxoid Conjugate)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Rotavirus Vaccine, Live, Oral, Pentavalent",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Hepatitis B Vaccine* [Recombinant] *as applicable",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Sanofi Pasteur, a Sanofi Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "42 Days",
        "maximum_age": "15 Months",
        "sex": "ALL",
        "summary": "42 Days to 15 Months"
      },
      "enrollment_count": 852,
      "start_date": "2020-05-22",
      "completion_date": "2023-08-10",
      "has_results": true,
      "last_update_posted_date": "2025-09-08",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 49,
      "location_summary": "Jonesboro, Arkansas • Bellflower, California • Huntington Park, California + 41 more",
      "locations": [
        {
          "city": "Jonesboro",
          "state": "Arkansas"
        },
        {
          "city": "Bellflower",
          "state": "California"
        },
        {
          "city": "Huntington Park",
          "state": "California"
        },
        {
          "city": "Huntington Park",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04398706"
    },
    {
      "nct_id": "NCT00258895",
      "title": "Safety and Immunogenicity of DAPTACEL® as 5th Dose in Children 4 to 6 Years Old After 4 Doses of Pentacel™ or DAPTACEL®",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Diphtheria",
        "Tetanus",
        "Pertussis"
      ],
      "interventions": [
        {
          "name": "DAPTACEL®: DTaP",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Sanofi Pasteur, a Sanofi Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "4 Years",
        "maximum_age": "6 Years",
        "sex": "ALL",
        "summary": "4 Years to 6 Years"
      },
      "enrollment_count": 649,
      "start_date": "2005-03",
      "completion_date": "2007-04",
      "has_results": true,
      "last_update_posted_date": "2016-04-14",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 22,
      "location_summary": "Fayetteville, Arkansas • Jonesboro, Arkansas • Little Rock, Arkansas + 18 more",
      "locations": [
        {
          "city": "Fayetteville",
          "state": "Arkansas"
        },
        {
          "city": "Jonesboro",
          "state": "Arkansas"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Fountain Valley",
          "state": "California"
        },
        {
          "city": "Centennial",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00258895"
    },
    {
      "nct_id": "NCT03950986",
      "title": "Increasing Vaccine Uptake Among Veterans at the Atlanta VA Health Care System",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Influenza",
        "Tetanus",
        "Diphtheria",
        "Pertussis",
        "Pneumonia"
      ],
      "interventions": [
        {
          "name": "Modified clinical reminders",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Atlanta VA Medical Center",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 67000,
      "start_date": "2018-10-15",
      "completion_date": "2019-06-30",
      "has_results": false,
      "last_update_posted_date": "2020-01-10",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 1,
      "location_summary": "Decatur, Georgia",
      "locations": [
        {
          "city": "Decatur",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03950986"
    },
    {
      "nct_id": "NCT02500511",
      "title": "Persistence of Protective Antibody Titers 12-24 Months After NmVac4-A/C/Y/W-135-DT Vaccination: Follow Up Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Meningococcal Meningitis",
        "Meningococcal Infections"
      ],
      "interventions": [
        {
          "name": "NmVac4-A/C/Y/W-135-DT™",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "JN-International Medical Corporation",
      "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": 50,
      "start_date": "2015-06",
      "completion_date": "2015-09",
      "has_results": false,
      "last_update_posted_date": "2016-04-12",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 1,
      "location_summary": "Towson, Maryland",
      "locations": [
        {
          "city": "Towson",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02500511"
    },
    {
      "nct_id": "NCT00804284",
      "title": "Database Surveillance Safety Study of PENTACEL® Vaccine",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Diphtheria",
        "Tetanus",
        "Pertussis",
        "Haemophilus Influenzae"
      ],
      "interventions": [
        {
          "name": "DTaP-IPV/Hib",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Other DTap Vaccines",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Sanofi Pasteur, a Sanofi Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Weeks",
        "maximum_age": "24 Months",
        "sex": "MALE",
        "summary": "6 Weeks to 24 Months · Male only"
      },
      "enrollment_count": 62538,
      "start_date": "2008-09",
      "completion_date": "2015-01",
      "has_results": false,
      "last_update_posted_date": "2015-08-19",
      "last_synced_at": "2026-05-22T09:47:16.742Z",
      "location_count": 1,
      "location_summary": "Oakland, California",
      "locations": [
        {
          "city": "Oakland",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00804284"
    }
  ]
}