National Surveillance for Clostridioides difficile Infection, Sweden, 2009-2016

Area of Science:

• Infectious Diseases
• Microbiology
• Public Health Surveillance

Background:

• Clostridioides difficile infection (CDI) remains a significant healthcare challenge globally.
• Surveillance programs are crucial for monitoring trends in CDI incidence and antimicrobial resistance.
• Sweden has historically reported high CDI rates despite low antimicrobial drug use.

Purpose of the Study:

• To analyze trends in CDI incidence and the prevalence of multidrug-resistant isolates in Sweden between 2012 and 2016.
• To investigate the impact of diagnostic methods and hygiene interventions on CDI rates.
• To identify factors contributing to the unexpected high CDI incidence in Sweden.

Main Methods:

• National surveillance data for Clostridioides difficile infection (CDI) in Sweden from 2012-2016.
• Analysis of CDI incidence rates and proportions of multidrug-resistant isolates.
• Assessment of the correlation between diagnostic testing methods (nucleic acid amplification testing) and CDI trends.
• Evaluation of the role of hygiene measures in CDI reduction.

Main Results:

• A 22% decrease in CDI incidence and an 80% reduction in multidrug-resistant isolates were observed from 2012-2016.
• Diminished variation in incidence across counties suggests improved control measures.
• Nucleic acid amplification testing introduction did not correlate with increased CDI incidence.
• Effective implementation of hygiene measures was identified as a primary driver for the observed incidence decrease.

Conclusions:

• Successful implementation of hygiene measures and diagnostic strategies has led to significant reductions in CDI in Sweden.
• Despite reductions, Sweden's CDI incidence remains high, warranting further investigation into underlying causes.
• The findings highlight the importance of robust surveillance and infection control programs for managing CDI.