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A single-celled parasite Toxoplasma is called the “mind control” parasite. It can infect the brains of mammals. It makes rodents fearless and bold. In wolves, individuals carrying this parasite often become pack leaders. In humans, it is known that the parasite only causes cold-like symptoms so far.

トキソプラズマという単細胞の寄生虫は哺乳類によくつくが、げっ歯類だと脳に寄生して恐怖心をなくし行動を大胆にさせるという。狼でもこの寄生虫を宿した個体は群れのリーダーになることが多いらしい。人間だと風邪様症状が出る程度だと少なくとも言われてるが

https://www.science.org/content/article/parasite-makes-wolves-more-likely-become-pack-leaders