I asked my professor about this. He said there are hypotheses, but no conclusion. The most likely explanation , he said, might have something to do with archaea being closer to us than bacteria in the evolutionary tree.
xkcd
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But there are eukayotic parasites. They are even closer to us. This on its own is not an explanation.
I was wondering if it maybe has to do with the ecological niche of many of these archaea. They have evolved to live in conditions that are simply not accessible to other organisms which means they have no need to defend their nutrient sources/live off other organisms. Just a thought though
they probably dont produce toxins that harm humans in our gut, or skin, or nasal biomes like bacteria. also furhtermore bacteria have other ways to infiltrate cells
Do archea harm other mammals? Other vertabrates? Other animals? Other eukaryotes? As far as I can tell they don’t.
Why is it a suprise they don’t harm humans?
Also this meme is a bit weird. Because eukaryotes (so animals, plants and fungi) technically evolved from Archea. So if we apply classification biology logic we are Archea. And eukayotes do cause diseases in each other ie. parasitic worms.
But in practice in english Archea excludes the eukaryotic branch.