Related Experiment Video
Updated: Dec 28, 2025
12:58
A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
Published on: May 25, 2017
9.3K
Antibiotic Prescribing Choices and Their Comparative C. Difficile Infection Risks: A Longitudinal Case-Cohort Study
Kevin Antoine Brown1,2,3, Bradley Langford1, Kevin L Schwartz1,2,3,4
1Public Health Ontario, Toronto, Canada.
Summary
Clostridioides difficile infection risk rises with longer antibiotic use. Specific antibiotics, like moxifloxacin, pose higher risks than others, such as amoxicillin, even for similar infections.
Area of Science:
- Infectious Diseases
- Pharmacology
- Epidemiology
Background:
- Antibiotic use is a primary modifiable risk factor for Clostridioides difficile infection (CDI).
- Prescribers currently lack quantitative data on the comparative CDI risks of specific antibiotic regimens.
- Understanding these comparative risks is crucial for informed prescribing practices.
Purpose of the Study:
- To estimate the risks of CDI associated with specific antibiotic courses.
- To quantify the relationship between antibiotic duration and CDI risk.
- To compare CDI risks among different antibiotics used for similar indications.
Main Methods:
- A longitudinal case-cohort analysis was performed on nursing home residents in Ontario from 2012 to 2017.
- The primary exposure assessed was days of antibiotic receipt within the 90 days prior to CDI diagnosis.
- Adjusted regression models were used to evaluate the risk associated with 5- to 14-day courses of 18 different antibiotics.
Main Results:
- A total of 1708 CDI cases were identified.
- Longer antibiotic durations were associated with increased CDI risk: 10-day courses increased risk by 12% and 14-day courses by 27% compared to 7-day courses.
- For 7-day courses, moxifloxacin showed 121% higher risk than amoxicillin, ciprofloxacin 89% higher than nitrofurantoin, and clindamycin 112% higher than cloxacillin.
Conclusions:
- CDI risk escalates with increasing antibiotic treatment duration.
- Significant disparities in CDI risk exist between different antibiotic courses prescribed for similar indications.
- These findings highlight the need for risk-stratified antibiotic selection to mitigate CDI incidence.
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