Dormant viruses activate during spaceflight, putting future deep-space missions in jeopardy - Herpes viruses reactivate in more than half of crew aboard Space Shuttle and International Space Station missions, according to new NASA research, which could present a risk on missions to Mars and beyond.

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Dormant viruses activate during spaceflight, putting future deep-space missions in jeopardy - Herpes viruses reactivate in more than half of crew aboard Space Shuttle and International Space Station missions, according to new NASA research, which could present a risk on missions to Mars and beyond.