A National Institute of Health paper released in March has identified previously unseen and unknown variants of a bacterium known for being multi-drug resistant, have been isolated from the ISS.

Thirteen strains of Enterobacter bugandensis, have mutated and became genetically distinct compared to their Earth counterparts. The study also found that E. bugandensis coexisted with multiple other microorganisms, and in some cases could have helped those organisms survive. So far, NASA, Roscosmos, or any other international partners aboard the ISS have not reported infected astronauts or, worse, transmission of the species from the ISS to Earth.