Deconstructing the relative benefits of a universal glove and gown intervention on MRSA acquisition

Area of Science:

• Infectious disease epidemiology
• Healthcare-associated infection control
• Mathematical modeling in public health

Background:

• The Benefits of Universal Glove and Gown (BUGG) study demonstrated that universal glove and gown use in intensive care units (ICUs) reduced meticillin-resistant Staphylococcus aureus (MRSA) acquisition.
• The relative contributions of glove/gown barriers, hand hygiene, and reduced healthcare worker (HCW)-patient contact to this reduction were not previously quantified.

Purpose of the Study:

• To quantify the proportion of MRSA acquisition reduction attributable to universal glove and gown use, improved hand hygiene, and reduced HCW-patient contact rates.
• To utilize agent-based simulation modeling to dissect the impact of individual interventions within the BUGG study framework.

Main Methods:

• Modification and calibration of an existing agent-based model for MRSA transmission dynamics in an ICU setting.
• Validation of the model using data from the BUGG study.
• Application of a full 2^k factorial design to assess the independent and combined effects of interventions on MRSA acquisition.

Main Results:

• Universal glove and gown use accounted for approximately 44% of the observed decrease in MRSA acquisition rates.
• Improved hand hygiene compliance upon exiting patient rooms contributed 38.1% to the reduction.
• Reduced HCW-patient contact rates explained 14.5% of the decrease in MRSA acquisition.

Conclusions:

• Mathematical modeling indicates that the barrier effect of gloves and gowns was the most significant factor in reducing MRSA acquisition during the BUGG study.
• Improved hand hygiene and decreased HCW-patient contact were secondary but important contributors to infection control.
• These findings highlight the multifaceted approach required for effective MRSA control in ICUs.