14. Guinea worm – The guinea worm is a tricky little parasite – as the female worm grows in the host, it eventually causes painful, burning lesions to form on the person's skin. Why? Well, to get the hell out of there. Considering the natural response to submerge a burning area in water, the worm manipulates it so that it can escape into the water to continue spreading itself.
13. Trypanosoma brucei – Victims of this parasite can find themselves infected with African trypanosomiasis might not immediately be aware of what is happening. It first starts with fevers, headaches, etc., but after a while, you may understand that something is wrong when you experience the later symptoms: sleep troubles, coordination issues, numbness, and more. The worst part is that if you don't catch it early, it is a much harder process to cure.
12. Loa loa – A creepy little nematode that has a penchant for squirming about, only becoming apparent to the host once they begin burrowing through their eye, able to watch it as it wiggles and writhes underneath. Worse yet, its victims can incur brain damage. Avoiding fly bites can help prevent it in the first place, but early treatment with anesthetics can effectively remove it before anything significant has happened.