Researchers found five strains of a multidrug-resistant bacterium similar to hospital-acquired infections on the International Space Station, raising concerns about the organisms' health implications for future missions. Resembling a bacterium recently discovered infecting newborns and one elderly immunocompromised patient across three hospitals, the Enterobacter bugadensis strains found on the ISS were not infectious to humans in their current form. However, their genomes are similar enough to three pathogenic Earth strains to warrant further study, according to researchers at California Institute of Technology's Jet Propulsion Laboratory Biotechnology and Planetary Protection Group. All five bacterial strains were resistant to five of the most commonly-used antibiotics, including penicillin, and "resistant or intermediate resistant" to two more. Enterobacter species are commonly found in the human intestinal tract, as well as in sewage and soil, but they have also been implicated in