Space flights are all the rage, but what happens to immunity up there?

The suppression of the immune system during space flight is a well-documented phenomenon.

VSS Unity
VSS Unity, image courtesy of NASA.

During the Apollo missions in the ’60s and ’70s, for instance, many astronauts became sick with colds and other infections within a week of their return to Earth.

Clinicians have also observed the reawakening of dormant viral infections, such as herpes simplex,