Methicillin-resistant Staphylococcus aureus: source control and surveillance organization

Area of Science:

• Infectious Diseases
• Hospital Epidemiology
• Clinical Microbiology

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) is a persistent nosocomial pathogen globally impacting patient care quality perception.
• Current MRSA control strategies include education, antibiotic stewardship, active surveillance cultures (ASCs), and isolation protocols.
• Despite interventions, MRSA remains endemic, with the utility of ASCs, particularly outside intensive care units (ICUs), under ongoing discussion.

Purpose of the Study:

• To evaluate the current evidence regarding the effectiveness and appropriate application of active surveillance cultures (ASCs) for MRSA.
• To assess the role of rapid molecular detection methods in MRSA screening within various hospital settings.
• To inform guidelines on MRSA screening practices, considering laboratory preparedness and intervention monitoring.

Main Methods:

• Review of published studies on MRSA screening interventions, including active surveillance cultures (ASCs) and rapid molecular detection methods.
• Analysis of studies considering diverse settings (ICU, medical/surgical wards), patient populations, and infection control measures.
• Consideration of laboratory workload, turnaround times, and effectiveness monitoring for screening interventions.

Main Results:

• The role and extent of ASCs for MRSA detection remain a subject of debate, with international guidelines recommending their use primarily in ICUs.
• Routine screening of all hospital admissions is generally not advocated, with local decisions based on non-ICU patient risk factors.
• Existing evidence does not support the broad implementation of rapid molecular screening for MRSA across all hospital settings.

Conclusions:

• Widespread application of rapid molecular screening for MRSA is not currently supported by available evidence.
• ASC strategies should be carefully considered, potentially limited to high-risk areas like ICUs, with local risk factor assessments for other patients.
• Effective MRSA control requires robust laboratory capacity, reduced screening test turnaround times, and continuous monitoring of intervention effectiveness.