Assessing the risk of transfer of microorganisms at the International Space Station due to cargo delivery by commercial resupply vehicles

This research paper looks into how spacecraft, like those carrying supplies to astronauts on the International Space Station (ISS), are kept clean and free from harmful microbes. The study found that special rooms called "cleanrooms" where these spaceships are built do a great job at keeping them sterile during assembly. The researchers compared different parts of two types of spacecraft, known as CRV1 and CRV2, to see if there were any differences in the microbes present on their surfaces before they go up into space. They discovered that while some areas had a mix-up with tiny organisms from Earth (forward contamination), other spots seemed pretty clean or only slightly different between the two types of ships. The findings suggest we should keep following strict rules for keeping these spaceships sterile, especially before they head to space and back again on missions like resupplying astronauts with food and equipment. This is important because it helps prevent unwanted organisms from Earth getting mixed up in our exploration of other planets or bringing them back home when we return from the ISS.

This research paper delves into the critical issue of forward contamination risk associated with interplanetary missions, particularly focusing on spacecraft assembly protocols and their efficacy in mitigating such risks. The study is grounded in methodologies that involve cleanroom practices for assembling commercial resupply vehicles (CRV) surfaces to prevent biological contaminants from reaching the International Space Station (ISS). The researchers employed a comparative analysis of CRV1 and CRV2 samples, examining their microbial communities on internal versus external GSE-treated locations. The findings revealed significant differences in phylum and class between these two sets at both treated and untreated sites (p<0.05), suggesting that the cleanroom protocols are effective to a certain extent but may require further refinement, especially for internal surfaces where no differences were detected using Mann-Whitney-Wilcoxon statistics between CRV1 and CRV2 at domain, class, or species levels (p>0.05).