Quoth Andara Bledin
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For the tape worm to have infected his brain, he had to get it from direct fecal ingestion. Most likely human. The tape worm has a very complicated life cycle, and certain stages infect certain organs. The "brain" stage if you will, is the first, meaning ingestion of an egg. It's the more developed adult that attach to the intestine.
In nature, the tape worm eggs are usually ingested by insects, the developing larva then control the brain of the insect and put them in positions to be vulnerable to ingestion by mammals. That's how rabbits, pigs, and cows get the larva in their system, where it infects organs and muscle tissue. Then if infected meat is consumed by humans the tape worm in it's adult stage attached to intestines and leeches off the nutrients and produces eggs which are excreted in feces.
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