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Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
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Related Experiment Video

Updated: Oct 19, 2025

Probiotic Studies in Neonatal Mice Using Gavage
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ARGuing the case for (or against) probiotics.

Sondra Turjeman1, Omry Koren1

  • 1Azrieli Faculty of Medicine, Bar-Ilan University, Safed, Israel.

Trends in Microbiology
|September 26, 2021
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Summary

Probiotics may not restore gut microbiota after antibiotic treatment or prevent antibiotic resistance gene spread. A recent study challenges the common belief that these supplements are beneficial post-antibiotic therapy.

Keywords:
antibiotic-resistance genesmetagenomemicrobiomeprobiotics

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Area of Science:

  • Microbiology
  • Medical Science
  • Genetics

Background:

  • Antibiotic resistance is a major global health threat.
  • Antibiotics disrupt the gut microbiota.
  • Probiotics are often considered to restore microbiota and combat antibiotic resistance.

Purpose of the Study:

  • To investigate the efficacy of probiotics in restoring gut microbiota composition after antibiotic treatment.
  • To determine if probiotics can prevent the proliferation of antibiotic resistance genes in the gut microbiome.

Main Methods:

  • Analysis of gut microbiota composition using sequencing techniques.
  • Quantification of antibiotic resistance genes before and after probiotic administration.
  • Comparison of microbial communities in antibiotic-treated subjects with and without probiotic supplementation.

Main Results:

  • Probiotic administration did not significantly restore the gut microbiota to its pre-antibiotic state.
  • No significant reduction in the abundance or diversity of antibiotic resistance genes was observed with probiotic use.
  • Antibiotic treatment led to a significant decrease in microbial diversity and an increase in specific resistance genes.

Conclusions:

  • The study suggests that probiotics may not be effective in counteracting the negative effects of antibiotics on the gut microbiota.
  • Findings challenge the widespread assumption that probiotics can mitigate antibiotic resistance gene spread.
  • Further research is needed to understand the complex interactions between antibiotics, microbiota, and probiotics.