Universal vs Risk Factor Screening for Methicillin-Resistant Staphylococcus aureus in a Large Multicenter Tertiary...

Area of Science:

• Infectious Disease Epidemiology
• Hospital Infection Control
• Public Health Interventions

Background:

• Nosocomial infections, particularly methicillin-resistant Staphylococcus aureus (MRSA), pose a significant threat to patient safety.
• Screening protocols are crucial for controlling the spread of resistant bacteria within healthcare settings.
• The effectiveness of universal versus risk factor-based MRSA screening requires ongoing evaluation.

Purpose of the Study:

• To compare the clinical effectiveness of universal MRSA screening against risk factor-based screening.
• To determine the impact of these screening strategies on reducing nosocomial MRSA rates in hospitalized patients.
• To analyze trends in MRSA detection and incidence at a tertiary care facility.

Main Methods:

• A quasi-experimental study design was employed at the Ottawa Hospital.
• Data were collected over two periods: risk factor-based screening (24 months) and universal screening (20 months).
• Segmented regression modeling analyzed monthly nosocomial MRSA incidence rates, with Clostridium difficile infection rates and mupirocin prescriptions used as controls.

Main Results:

• No significant difference in the overall incidence of hospital-acquired MRSA was observed between the risk factor-based and universal screening periods.
• The MRSA detection rate per 1,000 admissions significantly increased from 9.8 to 26.2 with the shift to universal screening.
• A total of 644 new nosocomial MRSA cases were identified across both screening strategies.

Conclusions:

• Universal MRSA admission screening at the Ottawa Hospital did not demonstrate a significant reduction in nosocomial MRSA rates compared to risk factor-based screening.
• The study highlights the need for careful consideration of screening strategies' impact on detection rates versus actual incidence.
• Further research may be warranted to optimize MRSA control measures in hospital settings.