Scientists Found a Way to Beat Drug-Resistant Bacteria… in Outer Space

02/02/2026 | Rhodium Scientific | Press

They were ordinary bacteria and viruses, until they spent 25 days in zero gravity. Now, scientists are racing to understand what exactly changed

A batch of bacteria and viruses launched to the International Space Station returned to Earth with unexpected mutations that could help fight antibiotic-resistant infections. Researchers observed that in the absence of gravity, the microbes evolved along different paths than they do on Earth, changing the way they interact, adapt, and survive.

The project, led by the University of Wisconsin-Madison and Rhodium Scientific Inc., involved exposing Escherichia coli and its viral predator, the T7 bacteriophage, to microgravity conditions aboard the ISS. The goal was to examine how this hostile environment influenced the long-running biological standoff between the two organisms. The results were far from ordinary.

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Evolution in Zero Gravity

The team sent combinations of E. coli and T7 phages into orbit in 2020, where they were incubated for 25 days aboard the ISS. A parallel set of experiments was conducted simultaneously on Earth for comparison. According to the study published in the open-access journal PLOS Biology, researchers observed that:

“space fundamentally changes how phages and bacteria interact: infection is slowed, and both organisms evolve along a different trajectory than they do on Earth.”

Under microgravity, the bactaria acquired mutations in genes that control stress response and nutrient regulation. Its surface proteins, which are critical for phage attachment, also changed. These alterations forced the T7 phages to evolve in response, leading to slower but distinct adaptations.

Framework For Evaluating Bacteria–phage Interactions In Microgravity On The Iss — _{Framework for evaluating bacteria–phage interactions in microgravity on the ISS. Credit: PLOS Biology}

A Sharper Weapon Against UTIs

Once back on Earth, the researchers tested the space-mutated phages against common UTI-causing bacterial strains. According to the same source, these infections are largely driven by antibiotic-resistant E. coli, which account for more than 90 percent of all urinary tract infections.

Some of the phages that had evolved in space turned out to be exceptionally effective at killing these resistant strains.

“By studying those space-driven adaptations,” the team explained, “we identified new biological insights that allowed us to engineer phages with far superior activity against drug-resistant pathogens.”

Mutations In The T7 Phage Appeared Across Many Regions Of Its Genome. — _{Mutations in the T7 phage appeared across many regions of its genome. Credit: PLOS Biology}

Bringing Space Biology Down to Earth

The findings highlight the unusual but powerful potential of using space environments to accelerate bacterial and microbial evolution in useful directions. As stated by the biochemist Vatsan Raman, who led the project, space offered a natural pressure cooker for observing real-time adaptation under unique conditions that cannot be replicated on Earth.

The success of the experiment may point toward future biotechnological developments driven by space-based research. By capturing the evolutionary changes that took place in orbit, scientists now have new genetic material and design ideas for crafting phage-based therapies that can target infections conventional drugs can no longer treat.