I think he's a human astronaut. His boots have germs he is not aware of, which prove fatal to the aliens. It might be by Arthur C. Clarke.
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There is a lot of guidance in this post to help you describe the story you're looking for in more detail - you can edit in anything else you remember.– GallifreyanCommented May 13, 2017 at 21:41
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1Vaguely reminiscent of Clarke's "Before Eden", which was the answer to this other question. Could that be the one you're thinking of?– user14111Commented May 13, 2017 at 22:36
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That's it! I just read it. It's a wonderful cautionary tale. I thank you for pointing it out to me.– Robert GarnerCommented May 14, 2017 at 0:07
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