It resembles something out of a science fiction or possibly even a horror story. Space stations are typically perceived as sterile environments that are clean and devoid of bacteria. However, this is not the case, as recent observations have revealed that bacteria are mutating aboard the International Space Station. This phenomenon has been characterized as “being unlike anything seen before,” which is concerning news, particularly for the astronauts present. In the article below, we will delve into the study that explores this peculiar occurrence.

For the past 75 years, humanity has been exploring space, launching countless objects beyond Earth. In 2023 alone, 2,644 objects were sent into space. It’s hard to fathom the amount of bacteria that likely accompanied them. This doesn’t seem to raise much alarm, as most bacteria are generally harmless and incapable of causing any harm. However, certain strains are known to be hazardous, like Enterobacter bugandensis. Interestingly, this very strain was identified aboard the International Space Station back in 2018.

At that time, researchers identified five distinct strains of the bacteria. However, after further investigation, they discovered eight additional strains. These strains were linked to serious clinical infections and exhibited resistance to multiple antibiotics. The typical microbes and bacteria that coexist with astronauts on the International Space Station play a crucial role in maintaining their health. However, the emergence of harmful, mutating bacteria raises obvious concerns for the safety of the crew. The researchers stated that they had identified “certain genes from our study that are exclusively present in organisms associated with the ISS, but not in their terrestrial counterpart.”

The International Space Station is frequently described as a “highly controlled environment, characterized by microgravity, increased CO2 levels, and elevated solar radiation.” Yet, even with this level of control, microorganisms are still able to infiltrate and mutate within this setting. Some scientists believe that in the weightlessness of space, certain microorganisms can change rapidly. They may become more resistant to antibiotics and more dangerous. This can occur through quick mutations or by sharing genetic material with other microorganisms (horizontal gene transfer).

Enterobacter bugandensis appears to have adapted uniquely to life on the space station, eventually becoming different from its Earth-based counterparts. A study from March 2024 identified this particular bacterium as an “opportunistic pathogen.” In essence, this means that the bacterium only poses a risk to individuals already battling illness or with compromised immune systems. While this might not be concerning for a healthy person on Earth, astronauts frequently experience immune system challenges due to the extended durations they spend in space.