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Multiresistant bacteria as a hospital epidemic problem
P J Dennesen1, M J Bonten, R A Weinstein
1Department of Internal Medicine, University Hospital Maastricht, The Netherlands.
Abstract:
Since the introduction of antibiotics into clinical use, bacteria have protected themselves by developing antibiotic resistance mechanisms. Currently, there are increasing problems worldwide with multiresistant bacteria. These problems are especially evident within hospitals, where they frequently present as nosocomial epidemics. Currently, the most important nosocomial resistance problems on a global scale are caused by methicillin-resistant Staphylococcus aureus, vancomycin-resistant enterococci and Enterobacteriaceae with plasmid-encoded extended-spectrum beta-lactamases. In this review we describe the characteristics of nosocomial epidemics of these three groups of multiresistant nosocomial pathogens. Despite the differences in bacterial species, the differences in mechanisms of resistance, the different ecological niches and the different infections caused by these pathogens, there are striking similarities in the variables determining nosocomial spread. The existence of each of these multiresistant micro-organisms and their concurrent spread seem to result from extensive antibiotic use and lapses in compliance with infection control measures. Problems with these bacteria became evident as monoclonal outbreaks, soon followed by establishment of endemicity especially in intensive care units. Finally, endemicity seems to be established on general hospital wards and in chronic care facilities and nursing homes, creating a continuous influx of colonized patients into special care wards. High compliance with infection control measures and a prudent and more restrictive use of antibiotics are the key measures to prevent these epidemics.
Insights
Multiresistant bacteria, including MRSA and VRE, cause global hospital epidemics. Controlling their spread requires strict infection control and reduced antibiotic use.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Public Health
Background:
- Antibiotic resistance is a growing global health crisis, particularly in hospital settings.
- Multiresistant bacteria, such as methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), and extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae, are major causes of nosocomial epidemics.
- These pathogens pose significant challenges due to their resistance mechanisms, diverse ecological niches, and the infections they cause.
Purpose of the Study:
- To review the characteristics of nosocomial epidemics caused by MRSA, VRE, and ESBL-producing Enterobacteriaceae.
- To identify common factors contributing to the spread of these multiresistant pathogens in healthcare settings.
- To highlight effective strategies for preventing and controlling nosocomial outbreaks.
Main Methods:
- This review synthesizes information on the epidemiology and control of three key groups of multiresistant nosocomial pathogens.
- It examines the similarities in factors driving nosocomial spread despite differences in bacterial species and resistance mechanisms.
- The review analyzes the progression of outbreaks from monoclonal events to endemicity within healthcare facilities.
Main Results:
- Despite variations, the spread of MRSA, VRE, and ESBL-producing Enterobacteriaceae is driven by similar factors.
- Extensive antibiotic use and inadequate infection control measures are primary contributors to the emergence and spread of these resistant bacteria.
- These pathogens evolve from initial outbreaks to endemicity, particularly in intensive care units, and subsequently spread to general wards and long-term care facilities.
Conclusions:
- Strict adherence to infection control protocols is crucial for preventing the spread of multiresistant bacteria.
- Prudent and restricted antibiotic use is essential to mitigate the development and dissemination of resistance.
- A combination of enhanced infection control and judicious antibiotic stewardship is key to combating nosocomial epidemics caused by these challenging pathogens.