Sunita Williams and Crew Face A Mutated Superbug on the International Space Station
Sunita Williams and Crew Face A Mutated Superbug on the International Space Station
On 16 April, NASA released findings from a study that identified 13 strains of the bacterial species Enterobacter Bugandensis on the ISS.
12 June 2024
Indian-origin astronaut Sunita Williams, alongside her colleague Butch Wilmore, successfully docked Boeing’s Starliner spacecraft at the International Space Station (ISS) on 6th June. Their mission marked a significant milestone as they became the first astronauts to participate in Boeing’s inaugural human flight as part of NASA’s commercial crew program.
Despite overcoming initial challenges like helium leaks and thruster malfunctions, a new and potentially hazardous issue has emerged on the ISS: the discovery of a mutated superbug, Enterobacter Bugandensis, which poses significant risks to the crew’s health.
The Mutated Superbug
On 16th April, NASA released findings from a study that identified 13 strains of the bacterial species Enterobacter Bugandensis on the ISS. Funded by an Ames Space Biology grant, this research highlighted that these strains have developed genetic and functional mutations distinct from their Earth counterparts, likely due to the extreme environmental conditions on the space station. These include elevated carbon dioxide levels, microgravity and increased radiation, which prompt microorganisms to adapt for survival.
The Origin of Enterobacter Bugandensis
Enterobacter species are commonly found in soil, sewage and commensal flora in the human gastrointestinal tract. On Earth, E. Bugandensis is associated with hospital-acquired infections, particularly in neonates and immunocompromised patients.
This bacterium can cause a variety of severe infections, including lower respiratory tract infections, skin and soft-tissue infections, urinary tract infections (UTIs), endocarditis and septic arthritis. The US National Institutes of Health has previously noted its association with neonatal sepsis, a potentially life-threatening condition in newborns.
Unique Environmental Factors on the ISS
The ISS provides a unique closed environment that differs significantly from Earth. The elevated levels of carbon dioxide, microgravity and radiation exposure create extreme conditions that influence microbial behaviour. According to NASA’s research, these conditions have allowed E. Bugandensis to not only survive but also to thrive and mutate, becoming genetically distinct from strains found on Earth. The bacteria’s ability to coexist with other microorganisms and potentially assist them in surviving further complicates the situation.
Astronaut Health
The presence of a multidrug-resistant bacterium like E. Bugandensis on the ISS is a serious concern. These “superbugs” are not extraterrestrial; they travel with astronauts and can become more potent in the unique environment of the space station. The mutated strains discovered on the ISS can affect the crew’s respiratory system and other bodily functions, posing a significant threat to their health and safety.
Dr Kasthuri Venkateswaran, a senior research scientist at NASA’s Jet Propulsion Laboratory, emphasised the importance of understanding how benign microorganisms adapt and survive in the extreme conditions of the ISS. This knowledge is crucial for developing strategies to counteract potential pathogenic threats, ensuring the well-being of astronauts during long-term missions.
Preventive Measures and Future Space Missions
The findings from this study underscore the need for robust preventive measures to mitigate the risks posed by such pathogens. As NASA continues to advance its commercial crew program and plans for future missions to low Earth orbit and beyond, ensuring the health and safety of astronauts remains a top priority. The insights gained from studying microbial behaviour in isolated environments like the ISS are invaluable for designing effective countermeasures.
Professor Karthik Raman, who has conducted extensive research on E. Bugandensis, noted that microbes are remarkably adaptable, thriving even in the most challenging conditions. This adaptability makes it imperative to continue monitoring and researching microbial life on the ISS to preemptively address any potential health risks.
The discovery of mutated strains of Enterobacter Bugandensis on the ISS presents a new challenge for Sunita Williams, Butch Wilmore, and the rest of the crew. The presence of these multidrug-resistant bacteria highlights the complexities and risks associated with space travel. As scientists continue to study these microorganisms, the knowledge gained will be crucial in safeguarding the health of astronauts on current and future missions. Despite the challenges, the success of Williams and Wilmore’s mission demonstrates the resilience and determination of the human spirit in the face of adversity.
