Antimicrobial Resistance Mechanisms in Healthcare Settings
Summary
Antimicrobial resistance (AMR) in healthcare environments arises from a variety of biochemical and genetic adaptations that enable pathogens to survive exposure to antibiotics, antiseptics and disinfectants. Core mechanisms include enzymatic inactivation of drugs, modification of target sites, reduced membrane permeability and active efflux of antimicrobial agents. In hospital wards and intensive-care units, repeated and sub-lethal exposure to antiseptics such as chlorhexidine or quaternary ammonium compounds can select for mutants with overexpressed efflux pumps or altered membrane structures. Mobile genetic elements—including plasmids and transposons—facilitate the horizontal transfer of resistance determinants among bacterial species, accelerating the spread of multidrug-resistant strains. Biofilm formation on medical devices and surfaces further shields communities of microorganisms from both chemical agents and host immunity, requiring higher concentrations of disinfectants to achieve eradication. The interplay between antibiotic stewardship, environmental decontamination protocols and real-time surveillance is essential to curb the emergence and dissemination of resistance in healthcare settings. Global collaboration on reduced biocide misuse, novel anti-resistance adjuvants and rapid diagnostics remains central to preserving the efficacy of existing therapeutics and preventing untreatable infections.
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Antimicrobial Resistance Mechanisms in Healthcare Settings publication trend
The graph below shows the total number of articles in antimicrobial resistance mechanisms in healthcare settings across all publications each year (not limited to Nature Index journals).
Technical terms
Efflux pump: Membrane-embedded protein complex that exports antimicrobial compounds out of bacterial cells.
Biofilm: Structured community of microorganisms encased in a self-produced extracellular matrix adherent to surfaces.
Horizontal gene transfer: Movement of genetic material between organisms by transformation, transduction or conjugation.
Sub-inhibitory concentration: Antimicrobial level below the minimum required to prevent microbial growth, often driving adaptive resistance.
Mobile genetic element: DNA segment such as a plasmid or transposon capable of moving within or between genomes, carrying resistance genes.
References
- Parallel evolutionary pathways to antibiotic resistance selected by biocide exposure. Journal of Antimicrobial Chemotherapy (2015).
- Quaternary ammonium disinfectants and antiseptics: tolerance, resistance and potential impact on antibiotic resistance. Antimicrobial Resistance & Infection Control (2023).
- Biocide Use in the Antimicrobial Era: A Review. Molecules (2021).
- Antimicrobial resistance in healthcare, agriculture and the environment: the biochemistry behind the headlines. Essays in Biochemistry (2017).
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