Because fungi cannot survive in our body. Our body temperature is too high and at best fungus can only be on our skin. For those zombie parasite fungi it needs to be on the brain/get to the brain of the organism. However there are bacterium/parasites which CHANGE the human behaviour by affecting our hormones,pituitary or our emotions to some extent. Anger due to steroids for example.
That being said, last of us video game plot basically involves this zombie fungi being adapted to human body temp.
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