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Originally posted by jukyu
Completely alien, completely unimpaired by our immune system.
Maybe we should examine returning probes from Mars at the Space Station before it is allowed to return to Earth?
Originally posted by picard_is_actually_a_grey
I dont quite understand the logic here, any viruses/bacteria evolved on mars will be totally alien to humans, so far we've never been there for them to evolve for us to carry as hosts. They would either be instantly killed in the new alien environment of earth or they would be quite harmless.