Next up: how the cows may be controlling the dairy farmerhttps://twitter.com/Psychobiotic/status/1061305014784794626 …
I think that toxoplasmosis makes people more impulsive and flu makes people more interested in social interaction. Both changes are maladaptive. Due to the way evolution works, our organism will trend towards the right level of impulsivity and sociality by itself.
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Both changes have negligible effect at the level of the individual, are adaptive at the level of toxoplasmosis and the flu, and are only maladaptive at the level of human society. However, there is rarely a cost to an infector for infecting people... 1/2
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So infecting people with toxoplasmosis and the flu will rarely affect one's reproductive fitness, and so there is little genetic push on the part of humans against their spread. Humans may trend towards healthy impulsivity and sociality sans pathogens, but not with them. 2/2
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