Wherever you find people, you also find bacteria and other microorganisms. The International Space Station is no exception.
That generally is not a problem. For one thing, the space station is kept cleaner than many environments on Earth. Routine cleaning activities are included on astronaut task schedules. Cargo sent to the station, and the vehicles that carry it, undergo a rigorous cleaning process and monitoring for microorganisms before launch. Crew members assigned to the space station spend 10 days in pre-flight quarantine.
For another, scientists regularly monitor the interior of this and other spacecraft, a process that started with the Apollo missions.
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