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NAP1 strain type predicts outcomes from Clostridium difficile infection.

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PubMed
Summary

The North American pulsed-field gel electrophoresis type 1 (NAP1) strain of Clostridium difficile infection (CDI) is linked to worse patient outcomes. Reducing NAP1 prevalence through antibiotic stewardship may decrease CDI severity.

Keywords:
Clostridium difficileclinical outcomesepidemiologystrain typing

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Area of Science:

  • Infectious Diseases
  • Microbiology
  • Epidemiology

Background:

  • Conflicting studies exist on the impact of the fluoroquinolone-resistant North American pulsed-field gel electrophoresis type 1 (NAP1) strain on Clostridium difficile infection (CDI) outcomes.
  • Strain typing is crucial for understanding the epidemiology and clinical impact of CDI.

Purpose of the Study:

  • To identify prevalent Clostridium difficile strain types causing CDI.
  • To evaluate the association between specific strain types and patient outcomes, including severe disease and mortality.

Main Methods:

  • Population-based surveillance identified CDI cases.
  • Multivariate regression models analyzed associations between strain type and severe disease, severe outcome, and 14-day mortality.
  • Strain typing was performed on 2057 CDI cases.

Main Results:

  • The most common strains were NAP1 (28.4%), NAP4 (10.2%), and NAP11 (9.1%).
  • The NAP1 strain was significantly associated with increased odds of severe disease (AOR, 1.74), severe outcome (AOR, 1.66), and 14-day death (AOR, 2.12) after adjusting for risk factors.
  • Severe disease occurred in 17.7%, severe outcome in 4.9%, and 14-day death in 2.7% of cases.

Conclusions:

  • The NAP1 strain is the most prevalent and a significant predictor of severe CDI, adverse outcomes, and mortality.
  • Strategies targeting NAP1 reduction, such as antibiotic stewardship to limit fluoroquinolone use, could mitigate CDI morbidity.