Toxoplasma gondii seems to be a favourite example of a mind-altering parasite (in rodent and human hosts). Then I started reading the background research for that particular parasite, and it’s all rather flimsy and uncorroborated – accepted more because of the narrative appeal than for the strength of the data.
It’s as if we collectively suffer from mind-altering parasites which make us want to believe in mind-altering parasites.
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