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Methicillin-resistant Staphylococcus aureus and its relationship to antimicrobial use: possible implications for
1National Center for Hospital Hygiene, Statens Serum Institut, Copenhagen, Denmark. dom@ssi.dk
Abstract:
The control of methicillin-resistant Staphylococcus aureus (MRSA) is still an unresolved issue in numerous healthcare institutions worldwide. Guidelines for the control of MRSA in hospitals focus on measures to control cross-transmission and prevent colonization, but rarely specifically mention the control of antimicrobial use. We reviewed the different types of evidence for a causal relationship between MRSA and antimicrobial use by classifying them in four categories: consistent associations, dose-effect relationships, concomitant variations, and arguments to support a plausible biological model to explain this relationship. Although the relative participation of cross-transmission and antimicrobial selection pressure in the level of MRSA observed in a healthcare setting remains to be determined, we found lines of evidence to support the existence of a relationship between MRSA and antimicrobial use in each of the four categories. This review points out the relative lack of studies specifically designed to investigate this aspect of MRSA epidemiology and the need to implement such studies quickly. In the meantime, the results presented here should encourage the implementation of antimicrobial-use improvement programs in hospitals in addition to existing infection control measures, which are still a priority in countries with high MRSA prevalence.
Insights
Antimicrobial use is linked to methicillin-resistant Staphylococcus aureus (MRSA) spread in hospitals. Further studies are needed, but improving antimicrobial use alongside infection control is recommended.
Area of Science:
- Infectious Diseases
- Hospital Epidemiology
- Antimicrobial Stewardship
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) remains a significant healthcare challenge globally.
- Current MRSA control guidelines primarily focus on transmission and colonization, often overlooking antimicrobial use.
- The role of antimicrobial selection pressure in MRSA epidemiology requires further investigation.
Purpose of the Study:
- To review and categorize evidence supporting a causal relationship between antimicrobial use and MRSA.
- To highlight the need for studies specifically addressing this aspect of MRSA epidemiology.
- To advocate for antimicrobial-use improvement programs in healthcare settings.
Main Methods:
- Classification of evidence into four categories: consistent associations, dose-effect relationships, concomitant variations, and plausible biological models.
- Review of existing literature on MRSA and antimicrobial use.
- Analysis of the interplay between cross-transmission and antimicrobial selection pressure.
Main Results:
- Evidence supporting a link between antimicrobial use and MRSA was found across all four reviewed categories.
- A significant gap exists in studies specifically designed to investigate the impact of antimicrobial use on MRSA.
- The precise contribution of cross-transmission versus antimicrobial selection pressure to MRSA levels is yet to be fully determined.
Conclusions:
- A relationship between antimicrobial use and MRSA prevalence in healthcare settings is supported by multiple lines of evidence.
- There is an urgent need for dedicated research into the specific mechanisms driving this association.
- Implementing antimicrobial stewardship programs is crucial, complementing existing infection control strategies for MRSA management.