Developing Microbials to Fight Extended-spectrum Beta-lactamase (ESBL)-Producing Escherichia Coli

June 15, 2026 updated by: University Hospital, Basel, Switzerland
This study is to identify and isolate well-defined microbials (non-ESBL E. coli) in an observational setting exploring natural gastrointestinal decolonization of humans colonized with ESBL E. coli.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

Antibiotic resistance is a severe threat to contemporary medicine. Effective approaches to fight multi-drug resistant pathogenic bacteria are needed.

This clinical observational study is to investigate whether express extended spectrum beta lactamases (ESBL) E. coli colonizing the human gut can be out-competed by other, ideally pan-sensitive strains (non-ESBL E. coli).

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
39

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Switzerland
      • Basel, Switzerland, 4031
        • University Hospital Basel, Division of Clinical Microbiology

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Sampling Method

Probability Sample

Study Population

Clients planning to travel to Southeast Asia will be recruited while receiving pre-travel health advice at the travel clinic of the Swiss Tropical and Public Health Institute in Basel.

Description

Inclusion Criteria:

  • travelling to Southeast Asia (India, Bhutan, Nepal, Bangladesh, Myanmar, Thailand, Laos, Cambodia, Vietnam) for a maximum of 4 weeks.

Exclusion Criteria:

  • other travelling destinations than mentioned above
  • antibiotic use at the first sampling time
  • Participants who are not colonized will serve as a control group for microbiome comparison

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
travellers to Southeast Asia
Clients planning to travel to Southeast Asia will be recruited
Other: examination of stool sample
Each participant provides stool samples before and after travelling, after 2, 4, 6, 8, 10, 12, 16, 20 and 52 weeks. Stool samples will be used for isolating both a) ESBL E. coli strains and b) pan-sensitive E. coli strains. Part of the stool sample is stored for isolation of further E. coli clones and microbiota analysis of the isolation of other microbiota strains. All found Enterobacteriaceae will be screened for additional resistance such as Carbapenem and Colistin. In case of a specific resistance, this will be confirmed with additional phenotypic and genotypic tests such as ROSCO disk and polymerase chain reaction (PCR) based panel and whole genome sequencing in order to detect specific resistance mechanisms and genes. Bacteria will be sequenced using Illumina and Nanopore based sequencing. Bioinformatic analysis will allow to determine the whole bacterial genome with containing resistance genes and also describe the microbiota diversity over time in single individuals.
Other: patient questionnaire
Each participant will have to provide a questionnaire before and after travelling, as well after 2, 4, 6, 8, 10, 12, 16, 20 and 52 weeks.
Other: examination of blood sample
Each participant will have to provide a blood sample before and after travelling and after 6, 12 and 20 weeks. A serum sample (5mL) for antibody measurement and a 50 ml blood sample for recovery of peripheral blood mononuclear cells (PBMCs in 6 CPTs) for cell mediated immunity will be collected. Serum and PBMCs will allow the analysis of anti-E. coli humoral and cellular responses in order to characterize the individual immune response to specific bacteria over time. Single nucleotide polymorphisms associated with humoral and cellular immune responses will be characterized and linked to immunological and clinical phenotypes and endpoints of the study.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
proportion of patients being "naturally" decolonized from ESBL E. coli
Time Frame: 18 months
proportion of patients being "naturally" decolonized from ESBL E. coli at the end of the study period at 18 months
18 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
University Hospital, Basel, Switzerland

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Gebert Rüf-Stiftung

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Adrian Egli, PD Dr. med., Division of Clinical Microbiology, University Hospital Basel

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 13, 2019

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
February 9, 2020

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 31, 2025

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 17, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
February 17, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
February 21, 2021

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
June 17, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 15, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2019-00044; am21Egli

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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