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Unintended microbial growth can occur in these environments as in buildings on Earth from elevated moisture, such as from a temporary ventilation system failure. This growth can drive negative health outcomes and degrade building materials. We need a predictive approach for modeling microbial growth in these critical indoor spaces.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Here, we demonstrate that even short exposures to varying elevated relative humidity can facilitate rapid microbial growth and microbial community composition changes in dust from spacecraft. We modeled fungal growth in dust from the International Space Station using the time-of-wetness framework with activation and deactivation limited growth occurring at 85% and 100% relative humidity, respectively. Fungal concentrations ranged from an average of 4.4\u2009\u00d7\u200910\n                      <jats:sup>6<\/jats:sup>\n                      spore equivalents per milligram of dust in original dust with no exposure to relative humidity to up to 2.1\u2009\u00d7\u200910\n                      <jats:sup>10<\/jats:sup>\n                      when exposed to 100% relative humidity for 2\u00a0weeks. As relative humidity and time-elevated increased, fungal diversity was significantly reduced for both alpha (\n                      <jats:italic>Q<\/jats:italic>\n                      \u2009&lt;\u20090.05) and beta (\n                      <jats:italic>R<\/jats:italic>\n                      <jats:sup>2<\/jats:sup>\n                      \u2009=\u20090.307,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.001) diversity metrics. Bacteria were unable to be modeled using the time-of-wetness framework. However, bacterial communities did change based on constant relative humidity incubations for both beta (\n                      <jats:italic>R<\/jats:italic>\n                      <jats:sup>2<\/jats:sup>\n                      \u2009=\u20090.22,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.001) and alpha diversity decreasing with increasing moisture starting at 85% relative humidity (\n                      <jats:italic>Q<\/jats:italic>\n                      \u2009&lt;\u20090.05).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Our results demonstrate that moisture conditions can be used to develop and predict changes in fungal growth and composition onboard human-occupied spacecraft. This predictive model can be expanded upon to include other spacecraft environmental factors such as microgravity, elevated carbon dioxide conditions, and radiation exposure. Understanding microbial growth in spacecraft can help better protect astronaut health, fortify spacecraft integrity, and promote planetary protection as human activity increases in low-Earth orbit, the moon, Mars, and beyond.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s40168-024-01864-3","type":"journal-article","created":{"date-parts":[[2024,9,10]],"date-time":"2024-09-10T01:03:36Z","timestamp":1725930216000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Predicting how varying moisture conditions impact the microbiome of dust collected from the International Space Station"],"prefix":"10.1186","volume":"12","author":[{"given":"Nicholas","family":"Nastasi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ashleigh","family":"Bope","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marit E.","family":"Meyer","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John M.","family":"Horack","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karen C.","family":"Dannemiller","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,9,10]]},"reference":[{"key":"1864_CR1","volume-title":"Commercial Destinations in Low-Earth Orbit (LEO)","author":"NASA","year":"2022","unstructured":"NASA. 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