Have you ever developed a cold sore after a hard time at work or at home?
The herpes virus activates again and the same thing happens to astronauts.
Recent NASA research shows that more than half of the astronauts returning from space return home with resuscitated herpesviruses.
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They believe that it is because of all the stress they are going through: weightlessness, cosmic radiation, and separation from relatives.
The longer they are in space, the more likely it is to re-activate the viruses.
There are many different herpesviruses that cause, for example, chickenpox, shingles, genital herpes and cold sores.
Once these pathogens are present In your system they never go away, they just sleep and wake up at any time.
Most astronauts showed no symptoms and their re-activated herpesviruses were detectable only with medical tests. [1