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NASA flight surgeon Richard Scheuring monitors astronauts’ health before, during, and after their journeys into space. What he and others learn about space’s impact on health will help scientists develop novel treatments for people on Earth.

From microgravity to radiation, space wreaks havoc on astronauts’ immune systems, potentially putting them at risk of infection from microbes onboard.

With every launch, spacecraft carrying humans into space bring along a few uninvited guests.