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RE: The sleeper viruses that wake up in outer space. A hitchhiker's guide to biosafety for intergalactic travel.
So I presume until we can figure out how to create a machine which can give gravity to the international space station, space exploration can be dangerous especially when we are not aware of what we have, staying latent in our body.
I think it would be best to first nail down the exact mechanism of immunosuppression that happens in space. And yes even mice in both simulated microgravity and in spaceflight show similar effects. Though I wouldn't say that it is cleae evidence of role of microgravity, because mice can be stressed on these weird environment as well. But it is pointing at it for sure. With some stringent experiments it could be tested. Then we can screen the space travelers at least for latent viruses we know of and clear them off by CRISPR. So I wouldn't be surprised if I see space agencies across the globe investing in CRISPR tech as well. I mean if you have no latent demons inside you, there is nothing to worry about.