Clinical trial Recruiting at 2 sites Interventional Ages 18 to 90

Using non-pathogenic E.coli to prevent recurrent urinary tract infections

Official title: Bacterial Interference for Preventing Recurrent Urinary Tract Infection - New Ways of Treatment

Run by Odense University Hospital · NCT04846803 · Data updated 2026-11-12

This study is testing if a safe strain of E.coli can help prevent repeated urinary tract infections in people who often get them.

Quick facts

Study typeInterventional
Ages18 Years to 90 Years
SexAll
Enrollment80 (estimated)
SponsorOdense University Hospital
Academic / other
Locations2 sites (Aarhus N and 1 other locations)
StatusRecruiting
StartedJanuary 9, 2024
Main results expectedAugust 1, 2026
Study endsDecember 1, 2027
Registry record updatedSeptember 18, 2025
Trial IDNCT04846803 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults diagnosed with recurrent cystitis, having experienced multiple UTIs within the past year, and who have not responded to previous treatments.

Probably not a fit

Patients with malignancies in the urinary tract, kidney or bladder stones, those under 18 years old, pregnant or breastfeeding women, and individuals currently on oral antibiotics may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial investigates the use of a non-pathogenic strain of E.coli to prevent recurrent urinary tract infections (rUTIs) in patients who have experienced multiple infections. The study employs a placebo-controlled, double-blind methodology to assess the effectiveness of bladder lavage with the non-pathogenic E.coli compared to saline. The aim is to provide an alternative treatment option that reduces reliance on antibiotics, which are commonly used for UTIs. The trial is conducted at Odense University Hospital and includes patients with a history of recurrent cystitis.

Why it matters

Potential benefit: If successful, this treatment could significantly reduce the frequency of recurrent urinary tract infections and decrease antibiotic usage in affected patients.

How similar studies have gone: While the concept of bacterial interference is supported by laboratory studies, this specific clinical application is novel and has not been extensively tested in prior studies.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Diagnosed with recurrent cystitis including 2 times of rUTI within the last 6 months or 3 times in the last 12 months, where at least 2 cultures show the same bacteria.
* Normal investigation for lower urinary tract diseases (LUTD) including voiding diary, symptom scores, flexible cystoscopy, voiding diagram and test for residual urine.
* Failed previously treatments.
* Patients with native bladder with both spontaneous voiding, the need for clean intermittent catheter (CIC) or indwelling catheter.
* Patients with neurogenic and non-neurogenic bladder dysfunction.
* Patients with urostomy, kidney transplantation or another complicated genesis.
* Written consent.

Exclusion Criteria:

* Malignancy in the urinary tract, kidney-, ureteral- or bladder stones, age \< 18 years, pregnancy, breastfeeding. Patients in ongoing orally antibiotic treatment. Not able to speak or understand Danish.

Where it's running

  • Aarhus University Hospital
    Aarhus N, Denmark
    Recruiting
  • Odense University Hospital
    Odense C, Denmark
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.