Controlling methicillin-resistant Staphylococcus aureus: quantifying the effects of interventions and rapid...

Area of Science:

• Infectious Disease Epidemiology
• Healthcare-Associated Infections
• Mathematical Modeling in Public Health

Background:

• Control of nosocomial methicillin-resistant Staphylococcus aureus (MRSA) remains a global challenge.
• Existing nationwide MRSA control strategies, like "search & destroy" (S&D), lack robust study designs and face controversy in high-prevalence settings.
• Current infection control measures, such as isolating MRSA carriers identified by clinical cultures, are often insufficient.

Purpose of the Study:

• To quantify the effectiveness of various infection control measures against MRSA.
• To predict the impact of rapid diagnostic testing (RDT) on isolation requirements.
• To evaluate the feasibility of reducing MRSA prevalence in high-endemic settings.

Main Methods:

• Development and analysis of a stochastic three-hospital model.
• Utilized an analytical one-hospital model to assess infection control strategies.
• Simulated the effects of different interventions, including "search & destroy" (S&D) and rapid diagnostic testing (RDT).

Main Results:

• A combined approach of isolation and proactive screening (of high-risk patients and contacts) can maintain MRSA prevalence below 1%.
• Nationwide S&D implementation in high-endemic countries can reduce nosocomial MRSA prevalence to <1% within six years.
• Rapid diagnostic testing (RDT) can significantly decrease isolation needs, by over 90% in low-endemic and 20% in high-endemic settings.

Conclusions:

• A causal link exists between S&D strategies and low MRSA prevalence.
• Effective MRSA control requires a combined approach of isolation and screening, not solely relying on clinical cultures.
• MRSA prevalence can be substantially reduced in high-endemic settings through S&D or stepwise interventions, with RDT enhancing feasibility.