The stress of spaceflight gives viruses a holiday from immune surveillance, putting future deep-space missions in jeopardy — ScienceDaily

Herpes viruses reactivate in more than half of crew aboard Space Shuttle and International Space Station missions, according to NASA research published in Frontiers in Microbiology. While only a small proportion develop symptoms, virus reactivation rates increase with spaceflight duration and could present a significant health risk on missions to Mars and beyond. NASA’s rapid…