Plasmids retain antibiotic resistance genes

Antibiotic resistance persists in bacteria, even absent selection pressure from antibiotics.

Plasmids are pieces of independent DNA that often carry multiple antibiotic resistance genes. Plasmids can jump from one bacterium to another, spreading that resistance.

Now, a team of investigators in France has shown that bacteria that acquire plasmids containing resistance genes rarely lose them. The research was published in Antimicrobial Agents & Chemotherapy, a journal of the American Society for Microbiology.

In the study, the investigators focused on pla

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