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nonsignificant trend toward shortened thrombin time, pointing toward potential hypercoagulability. 29 However, there were no changes in coagulability or fibrinolysis markers such as D-dimer nor any observed changes in International Normalized Ratio and plasminogen activity. The absence of in-flight measurements for the above-mentioned studies limits our knowledge of the role of coagulability during spaceflight. Another spaceflight study performed a blood analysis preflight, on the day of return, and 1 wk after return to Earth, which demonstrated increased fibrinogen alpha

breathing zone while adhering to actinic dose EL. 1 Over the last several decades, photobiological studies have evaluated the sensitivities of a wide array of bacterial, fungal, and viral organisms to UV, particularly UV-C. 25 , 35 , 47 The Allen and Mills study (Allen GR, Mills WD. Personal communication; 2023) has shown that inactivation rates of aerosolized SARS-CoV-2 and other pathogens have been experimentally measured using 275-nm LEDs emitting UV light below the EL in a controlled room-sized aerosol chamber, confirming the expected D 90 dose and the expected