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Positive bacteria-phage interactions drive sulfamethoxazole removal.

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Viruses boost antibiotic degradation and reduce resistance gene spread in constructed wetlands. By enhancing beneficial bacteria and blocking resistant strains, phages offer a novel bioremediation strategy.

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Area of Science:

  • Environmental microbiology
  • Virology
  • Bioremediation

Background:

  • Antibiotics like sulfonamides are widespread pollutants.
  • Constructed wetlands use microbial communities for pollutant breakdown.
  • Bacteriophages are abundant viruses that influence bacterial communities and gene transfer.

Purpose of the Study:

  • To investigate the role of viruses in antibiotic degradation and antibiotic resistance gene (ARG) dissemination.
  • To determine if virus-bacteria interactions can enhance the removal of sulfamethoxazole (SMX).
  • To assess the impact of viruses on ARG transfer.

Main Methods:

  • Sediment microcosm experiments were conducted.
  • Phage-concentrated solutions were added to microcosms.
  • SMX removal efficiency and ARG abundance were measured.
  • Bacterial community composition and viral auxiliary metabolic genes (AMGs) were analyzed.

Main Results:

  • Phage addition increased SMX removal by up to 35%.
  • Viruses enriched SMX-degrading bacteria and augmented bacterial metabolism via AMGs.
  • Lytic viruses reduced ARG abundance by lysing resistant bacteria, not by promoting transduction.
  • Positive bacteria-phage interactions were key to improved SMX removal and restricted ARG transfer.

Conclusions:

  • Viruses play a significant role in regulating antibiotic degradation and ARG spread in constructed wetlands.
  • Virus-mediated processes, including AMGs and lytic activity, enhance bioremediation.
  • Targeting viral communities is a promising strategy for mitigating antibiotic pollution and resistance.