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Microbial biofilms: their development and significance for medical device-related infections
1Department of Microbiology and Immunology, University of Western Ontario, London, Canada.
Abstract:
Microbial adhesion and biofilm formation on medical devices represent a common occurrence that can lead to serious illness and death. The process by which bacteria and yeast colonize open and closed implants is fairly complicated and involves a series of steps commencing with deposition of host substances onto the material. Prevention and treatment of established biofilms with antimicrobial agents are difficult because the organisms are encased within a protected microenvironment. Efforts to reduce adhesion using specially developed materials, such as hydrophilic or heparin coated, have had modest success once applied to the patient. The reason, at least for the most part, is the diverse milieu into which devices are placed and the multitude of ways in which organisms can colonize surfaces. A better understanding of the process is required, and the knowledge gained must be used to devise new strategies as alternatives to the traditional employment of antibiotics. These new approaches may still use antibiotics but at different concentrations (low to prevent and high to treat infection) and in a different manner (perhaps spiked therapy in which there is a delay between doses to reduce the risk of drug resistance and impact on normal flora). The possibility of applying functional foods to patient management should also be pursued.
Insights
Preventing microbial biofilms on medical devices is challenging due to complex colonization processes. New strategies beyond traditional antibiotics, like altered antibiotic dosing or functional foods, are needed for better patient outcomes.
Area of Science:
- Biomaterials Science
- Microbiology
- Infectious Diseases
Background:
- Microbial adhesion and biofilm formation on medical devices are significant causes of illness and mortality.
- Biofilms are difficult to treat with conventional antimicrobial agents due to their protective microenvironment.
- Current strategies using specialized materials show limited success in diverse clinical settings.
Purpose of the Study:
- To highlight the complexity of microbial colonization on medical implants.
- To emphasize the need for novel strategies to combat biofilm formation.
- To explore alternative approaches to traditional antibiotic use.
Main Methods:
- Review of current literature on microbial adhesion and biofilm formation.
- Analysis of the limitations of existing prevention and treatment methods.
- Discussion of potential new therapeutic strategies.
Main Results:
- The process of biofilm formation is intricate, involving host substance deposition and diverse colonization pathways.
- Existing material-based interventions have shown only modest success.
- Traditional antibiotic approaches face challenges due to resistance and impact on normal flora.
Conclusions:
- A deeper understanding of microbial colonization mechanisms is essential for developing effective interventions.
- New strategies may involve modified antibiotic delivery (e.g., pulsed therapy) or novel agents like functional foods.
- Future research should focus on innovative methods to prevent and treat medical device-associated infections.