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Antibiotics can be used to contain drug-resistant bacteria by maintaining sufficiently large sensitive populations

Author

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  • Elsa Hansen
  • Jason Karslake
  • Robert J Woods
  • Andrew F Read
  • Kevin B Wood

Abstract

Standard infectious disease practice calls for aggressive drug treatment that rapidly eliminates the pathogen population before resistance can emerge. When resistance is absent, this elimination strategy can lead to complete cure. However, when resistance is already present, removing drug-sensitive cells as quickly as possible removes competitive barriers that may slow the growth of resistant cells. In contrast to the elimination strategy, a containment strategy aims to maintain the maximum tolerable number of pathogens, exploiting competitive suppression to achieve chronic control. Here, we combine in vitro experiments in computer-controlled bioreactors with mathematical modeling to investigate whether containment strategies can delay failure of antibiotic treatment regimens. To do so, we measured the “escape time” required for drug-resistant Escherichia coli populations to eclipse a threshold density maintained by adaptive antibiotic dosing. Populations containing only resistant cells rapidly escape the threshold density, but we found that matched resistant populations that also contain the maximum possible number of sensitive cells could be contained for significantly longer. The increase in escape time occurs only when the threshold density—the acceptable bacterial burden—is sufficiently high, an effect that mathematical models attribute to increased competition. The findings provide decisive experimental confirmation that maintaining the maximum number of sensitive cells can be used to contain resistance when the size of the population is sufficiently large.Adding antibiotic-susceptible cells to otherwise resistant bacterial populations can be used to slow microbial growth in the presence of antibiotics; this provides support for a containment strategy that aims to maintain the maximum tolerable number of pathogens, exploiting competitive suppression to achieve chronic control.

Suggested Citation

  • Elsa Hansen & Jason Karslake & Robert J Woods & Andrew F Read & Kevin B Wood, 2020. "Antibiotics can be used to contain drug-resistant bacteria by maintaining sufficiently large sensitive populations," PLOS Biology, Public Library of Science, vol. 18(5), pages 1-20, May.
  • Handle: RePEc:plo:pbio00:3000713
    DOI: 10.1371/journal.pbio.3000713
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    References listed on IDEAS

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    1. Teemu Kuosmanen & Johannes Cairns & Robert Noble & Niko Beerenwinkel & Tommi Mononen & Ville Mustonen, 2021. "Drug-induced resistance evolution necessitates less aggressive treatment," PLOS Computational Biology, Public Library of Science, vol. 17(9), pages 1-22, September.

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