Over the past two decades, the ISS has hosted nearly 300 astronauts.
Although astronauts tend to travel light, they do unintentionally bring their microbes with them to space.
As a result, a unique microbial population has grown on the space station.
The ISS is home to a unique population of microbes.Photo: NASA
As a result, the microorganisms have to adapt to survive.
The study found that under stress, E. bugandensis mutated to become more resistant to antimicrobial treatment.
Its also unclear whether these mutated, drug-resistant microbes pose a risk to humans on Earth.
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