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Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...
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Related Experiment Video

Updated: Jun 5, 2026

Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance
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Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance

Published on: May 2, 2018

Evolution of antibiotic resistance.

F Baquero1, J Blázquez

  • 1The Dept of Microbiology, Ramón y Cajai Hospital, National Institute of Health (INSALUD), C. Colmenar km 9,1, 28034 Madrid, Spain.

Trends in Ecology & Evolution
|January 18, 2011
PubMed
Summary

The global rise in antimicrobial resistance threatens medical progress. Environmental antibiotic pressure accelerates microbial evolution and the spread of resistance genes, risking a return to a pre-antibiotic era.

Area of Science:

  • Microbiology
  • Epidemiology
  • Evolutionary biology

Background:

  • The global spread of bacterial resistance to antimicrobial agents poses a significant threat to modern medicine.
  • Industrial production and widespread use of antibiotics create substantial environmental antibiotic pressure.

Purpose of the Study:

  • To investigate the mechanisms driving the genesis, selection, and dispersal of antimicrobial resistance.
  • To explore strategies for controlling the accelerating trend of microbial resistance.

Main Methods:

  • Focus on research into the mechanisms of resistance genetic determinant development.
  • Utilizing molecular epidemiology and mathematical modeling to study resistance trends.

Main Results:

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Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

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Last Updated: Jun 5, 2026

Testing the Role of Multicopy Plasmids in the Evolution of Antibiotic Resistance
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Published on: May 2, 2018

Quantification of Plasmid-Mediated Antibiotic Resistance in an Experimental Evolution Approach
12:32

Quantification of Plasmid-Mediated Antibiotic Resistance in an Experimental Evolution Approach

Published on: December 14, 2019

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
08:58

Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes

Published on: March 3, 2023

  • Environmental antibiotic pressure increases the diversity of resistant bacterial phenotypes.
  • This pressure selects for the fittest resistant bacteria and promotes the dispersal of resistance genes.
  • These factors significantly accelerate the rate of microbial evolution.

Conclusions:

  • The accelerating microbial evolution driven by antibiotic resistance is a critical global health concern.
  • Molecular epidemiology and mathematical models offer potential strategies to combat this trend.
  • Interventions are needed to prevent a return to a pre-antibiotic era.