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Is MRSA admission bacteraemia community-acquired? A case control study
Ruth Miller1, Hanif Esmail, Tim Peto
1Nuffield Department of Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK.
The Journal of Infection
|February 5, 2008
Summary
Most hospital-acquired methicillin-resistant Staphylococcus aureus (MRSA) bacteraemia cases originated from healthcare settings, not the community. However, many MRSA patients were admitted from home, indicating a need for further research into non-hospital determinants.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Epidemiology
Background:
- Methicillin-resistant Staphylococcus aureus (MRSA) poses a significant public health threat.
- Understanding the source of MRSA bacteraemia on hospital admission is crucial for effective control strategies.
Purpose of the Study:
- To compare the characteristics of MRSA and methicillin-susceptible S. aureus (MSSA) bacteraemia.
- To determine if MRSA bacteraemia detected on hospital admission is community-acquired.
Main Methods:
- A comparative study of consecutive MRSA bacteraemia cases admitted to general medicine (2003-2006) against age-matched MSSA controls.
- Analysis of demographics, risk factors, healthcare contact, and clinical presentation using patient records.
- Multi-locus sequence typing to characterize bacterial strains.
Main Results:
- MRSA strains were predominantly healthcare-associated (ST-22, ST-36).
- No cases met the definition of community-acquired MRSA.
- MRSA cases showed higher previous hospital exposure and more comorbidities than MSSA controls.
- A majority (63%) of MRSA cases were admitted from home, not healthcare facilities.
Conclusions:
- Healthcare-associated MRSA strains were the primary cause of MRSA bacteraemia on admission.
- Despite healthcare origins, most MRSA bacteraemia cases were admitted from patients' homes.
- Further investigation is required to understand MRSA bacteraemia drivers in non-hospital settings.
