There were several examples of a parasite changing a single behavior in the host. Ants that climbed up grass and were eaten by cows, and rats (or was it mice) that lost their fear of cat urine, both benefiting the parasite. To go from that and imply mind control is much to big a stretch to be realistic. SciFi stories have such events as a parasite controlling human minds. Changing a single behavior in an insect or animal that inherits that behavior rather than learns it is nothing like controlling behaviors of a human brain.

In addition, causing a brain defect in a fetus that leads to schizophrenia is hardly akin to a parasite controlling one's mind.

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