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 viral detection systems and ongoing treatment research are beginning to safeguard astronauts – and immunocompromised patients on Earth, too.

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