I thought this was cool to post about as i read this on Discover magazine about how parasites that are in certain insects, animals and yes humans travel to the brain and take over and make the host zombie like.
They feature a slide show of the 8 different creatures and the specific parasites that control their brains as it's a quick and interesting read.
The parasites in humans ''Toxoplasma Gondii'' are found all around the world and it can enter us because of eating undercooked meat and also stray cats carry it and pass it on to us and once in us we carry it for life.
Enjoy

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Zombie Animals and the Parasites that Control Them | Unusual Organisms | DISCOVER Magazine