He originally posted his story on kuro5hin[1]. It's an interesting read. He was interested in the worm because, for its survival, it has evolved a mechanism to disable the host's immune system in a particular way that eliminates allergies. At the time he wrote that nobody knows how the worm does it. Now that we can do similar things with monoclonal antibodies, I wonder if the mechanism is similar.

[1] http://web.archive.org/web/20151205143301/http://www.kuro5hi...