Study Suggests ISS Sterility May Harm Astronaut Health

Researchers propose introducing natural microbes to the space station to address immune dysfunction linked to its ultra-clean environment.

Astronauts aboard the ISS frequently experience immune-related health issues such as rashes and allergies, potentially linked to its excessively sterile conditions.
A study found the ISS lacks microbial diversity, particularly natural microbes from soil and water, which are beneficial to human health on Earth.
Human skin is the primary source of microbes on the ISS, with cleaning chemicals and disinfectants present throughout the station.
Different areas of the ISS host distinct microbial communities; for instance, dining areas have food-associated microbes, while bathrooms contain urine- and fecal-related microbes.
Researchers suggest fostering diverse microbial ecosystems on the ISS and exploring probiotic-based sanitation to improve astronaut health during long-term space missions.