And while the bacteria may not have made any astronauts sick, the authors say it’s pretty likely that they can.
The authors behind the study, published last week in BMC Microbiology, are primarily members of NASA’s Jet Propulsion Laboratory, which is managed by the California Institute of Technology.
The laboratory is the major research hub for NASA’s robotic space and Earth science missions, such as the Mars Curiosity rover, and also runs NASA’s Deep Space Network of satellites.
Within these samples, they found more than 100 bacterial genes known to help make bacteria resistant to antibiotics.
And strains belonging to a particular species of bacteria, Enterobacter bugandensis, were resistant to all nine antibiotics tested against them.
In this latest study, they hoped to figure out just how dangerous these strains could be to human health.