{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Shigella+challenge+strain",
    "query": {
      "intervention": "Shigella challenge strain"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 8,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-13T19:00:38.295Z",
  "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": "NCT00866476",
      "title": "Safety and Efficacy Study of CVD 1208S, a Live, Attenuated Oral Vaccine to Prevent Shigella Infection: Phase IIa",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Shigella"
      ],
      "interventions": [
        {
          "name": "CVD 1208S, a Shigella flexneri 2a live, oral vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 20,
      "start_date": "2010-01",
      "completion_date": "2010-02",
      "has_results": false,
      "last_update_posted_date": "2021-04-29",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00866476"
    },
    {
      "nct_id": "NCT03527173",
      "title": "A Study to Evaluate the Efficacy, Safety and Immunogenicity of a Vaccine Designed to Protect Against Infection With Shigella Sonnei in Healthy Adults",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Dysentery, Bacillary"
      ],
      "interventions": [
        {
          "name": "S.sonnei vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "S. sonnei 53G challenge strain",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "DRUG"
      ],
      "sponsor": "GlaxoSmithKline",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 71,
      "start_date": "2018-08-29",
      "completion_date": "2019-11-11",
      "has_results": true,
      "last_update_posted_date": "2020-07-28",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03527173"
    },
    {
      "nct_id": "NCT00485134",
      "title": "Shigella Flexneri 2a Invaplex 50 Vaccine Dose Finding and Assessment of Protection",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Shigellosis"
      ],
      "interventions": [
        {
          "name": "240 µg Shigella flexneri 2a Invaplex 50 vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "480 µg Shigella flexneri 2a Invaplex 50 vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "690 Shigella flexneri 2a Invaplex 50 vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Shigella challenge strain",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "U.S. Army Medical Research and Development Command",
      "sponsor_class": "FED",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 113,
      "start_date": "2007-05",
      "completion_date": "2010-09",
      "has_results": true,
      "last_update_posted_date": "2017-09-11",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 2,
      "location_summary": "Baltimore, Maryland • Silver Spring, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Silver Spring",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00485134"
    },
    {
      "nct_id": "NCT04078022",
      "title": "Shigella CVD 30000: Study of Responses to Vaccination With Shigella Vaccine",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Shigella"
      ],
      "interventions": [
        {
          "name": "SF2a-TT15 Shigella Vaccine",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "S. flexneri 2a strain 2457T Challenge Agent",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 58,
      "start_date": "2020-03-02",
      "completion_date": "2024-01-25",
      "has_results": true,
      "last_update_posted_date": "2024-05-20",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04078022"
    },
    {
      "nct_id": "NCT04992520",
      "title": "Controlled Human Infection Model Challenge/Rechallenge",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Shigellosis"
      ],
      "interventions": [
        {
          "name": "Shigella sonnei 53G",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Shigella flexneri 2a 2457T",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "PATH",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 46,
      "start_date": "2022-04-26",
      "completion_date": "2023-08-29",
      "has_results": true,
      "last_update_posted_date": "2025-01-31",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04992520"
    },
    {
      "nct_id": "NCT00866242",
      "title": "Safety and Efficacy Challenge Study of CVD 1208S, a Live, Attenuated Oral Vaccine to Prevent Shigella: Phase IIb",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Shigella"
      ],
      "interventions": [
        {
          "name": "CVD 1208S, Challenge strain of wild-type Shigella flexneri 2a",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "University of Maryland, Baltimore",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "45 Years",
        "sex": "ALL",
        "summary": "18 Years to 45 Years"
      },
      "enrollment_count": 20,
      "start_date": "2010-01",
      "completion_date": "2010-02",
      "has_results": false,
      "last_update_posted_date": "2021-04-29",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 2,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00866242"
    },
    {
      "nct_id": "NCT02816346",
      "title": "Dose-Finding Study of Lyophilized Shigella Sonnei 53G Challenge Strain",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Shigella sonnei 53G",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "PATH",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "49 Years",
        "sex": "ALL",
        "summary": "18 Years to 49 Years"
      },
      "enrollment_count": 56,
      "start_date": "2016-09-12",
      "completion_date": "2017-12-31",
      "has_results": true,
      "last_update_posted_date": "2019-06-03",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 1,
      "location_summary": "Cincinnati, Ohio",
      "locations": [
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02816346"
    },
    {
      "nct_id": "NCT04242264",
      "title": "Phase 2 Shigella Vaccine and Challenge",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Immunisation",
        "Shigella Infection"
      ],
      "interventions": [
        {
          "name": "Placebo",
          "type": "OTHER"
        },
        {
          "name": "Shigella sonnei strain 53G",
          "type": "BIOLOGICAL"
        },
        {
          "name": "WRSs2",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "OTHER",
        "BIOLOGICAL"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "49 Years",
        "sex": "ALL",
        "summary": "18 Years to 49 Years"
      },
      "enrollment_count": 69,
      "start_date": "2022-10-12",
      "completion_date": "2024-07-08",
      "has_results": true,
      "last_update_posted_date": "2026-08-10",
      "last_synced_at": "2026-09-13T19:00:38.295Z",
      "location_count": 2,
      "location_summary": "Decatur, Georgia • Cincinnati, Ohio",
      "locations": [
        {
          "city": "Decatur",
          "state": "Georgia"
        },
        {
          "city": "Cincinnati",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04242264"
    }
  ]
}