Is the International Space Station too clean?

Is the International Space Station too clean?

Keeping the International Space Station clean is a high priority for NASA. Air filters, weekly wipe-downs and vacuuming are a must. Still, astronauts there often develop health problems. These include immune problems, skin rashes and other conditions. A new study suggests one possible reason: The ISS might be too clean. Our health depends on interactions with microbes, such as bacteria and viruses. But samples from the ISS show a striking lack o…