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How to develop a controlled human infection model for Clostridioides difficile.

Annefleur D O Hensen1, Maria J G T Vehreschild2, Dale N Gerding3

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Clinical Microbiology and Infection : the Official Publication of the European Society of Clinical Microbiology and Infectious Diseases
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Summary

Developing a controlled human infection model for Clostridioides difficile (C. difficile) is crucial for testing new treatments. Experts discussed challenges in creating a safe and effective model to combat C. difficile infection (CDI).

Keywords:
C. difficileCHIMClostridioides difficileControlled humanExpert opinionHuman challenge studyInfection

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Area of Science:

  • Microbiology
  • Immunology
  • Infectious Diseases

Background:

  • Clostridioides difficile (C. difficile) infection (CDI) is a major cause of hospital-acquired diarrhea with high relapse rates.
  • Antibiotic resistance and unknown factors in fecal microbiota transplantation (FMT) hinder effective treatment.
  • Novel non-antibiotic strategies are needed to enhance colonization resistance and immune responses against CDI.

Purpose of the Study:

  • To establish a framework for a Controlled Human Infection Model (CHIM) for toxigenic C. difficile.
  • To enable testing of novel therapeutic approaches and identification of microbiota/immunological targets for CDI.
  • To address the ethical, scientific, logistical, and biosafety challenges associated with a toxigenic C. difficile CHIM.

Main Methods:

  • International experts convened in a workshop organized by Inno4Vac to discuss challenges in developing a C. difficile CHIM.
  • Key challenges identified include creating a clinically relevant model with mild-to-moderate symptoms, determining optimal inoculum dose, and understanding antibiotic pre-treatment protocols.

Main Results:

  • The expert consensus highlighted the need to overcome specific challenges to enable a functional C. difficile CHIM.
  • The model aims to induce mild to moderate CDI symptoms, not severe disease.
  • Optimal C. difficile inoculum dose and antibiotic pre-treatment parameters are critical for model development.

Conclusions:

  • A successfully developed C. difficile CHIM will facilitate the evaluation of new anti-CDI products.
  • This model will provide a platform for deeper understanding of CDI pathophysiology, pathogenesis, and immunology.
  • The CHIM framework is essential for advancing research and developing effective interventions against C. difficile.