I guess I would question the reasoning behind the needs for such a vaccine.
Is it for long term space endeavors ?
Yes, the article says they are trying to stop the muscle and bone atrophy of weightlessness and decided it would be great research for the earthbound elderly too.
I think they should work on gravity for spaceships instead. I mean, look at Star Trek. They can walk around and all species seem to be able to handle the same amount of gravity.
