Synergistic Effect of Combination Interventions for Methicillin-Resistant Staphylococcus aureus Transmission Control in Nursing Homes: A Computation Modelling Evaluation with Heterogeneous Contact Mixing

Area of Science:

• Infectious Disease Epidemiology
• Public Health
• Computational Modeling

Background:

• Nursing homes are significant reservoirs for methicillin-resistant Staphylococcus aureus (MRSA) colonization, presenting a major public health challenge.
• High colonization prevalence rates in nursing homes necessitate effective infection control strategies.

Purpose of the Study:

• To evaluate the impact of three intervention scenarios on MRSA colonization prevalence in nursing homes using a computational model.
• To assess the effectiveness of hand hygiene compliance, screening-and-isolation, and a combined approach.

Main Methods:

• A deterministic compartmental model with a heterogeneous contact matrix between residents and healthcare workers (HCWs) was utilized.
• Contact parameters were informed by a nursing home survey.
• Simulations modeled three intervention scenarios: improved HCW hand hygiene, admission screening and isolation, and a combination of both.

Main Results:

• A 10% reduction in average contamination duration for HCWs correlated with a 1.29 percentage point decrease in MRSA prevalence.
• The screening-and-isolation intervention alone reduced prevalence by an average of 19.04 percentage points.
• Implementing both hand hygiene and screening-and-isolation demonstrated synergistic effects, leading to greater prevalence reduction.

Conclusions:

• Combining hand hygiene improvements with screening-and-isolation strategies yields synergistic effects in reducing MRSA colonization prevalence in nursing homes.
• Multi-faceted intervention approaches are more effective than single interventions for controlling MRSA in these settings.
• The study provides evidence-based support for implementing integrated infection control measures in nursing home environments.