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NASA goes to obscene lengths to sterilize spacecraft, but once people start going all bets are off. I doubt there would be any meaningful results from such an experiment before human explorers arrive.
Even when humans are getting on the rocket everything is assembled in a clean room. Human skin oils do not mix well with stuff in space, so they dont like to get it on anything that moves, or holds, or even looks like it might do something that has a purpose.
