We've found the midichlorians!

(or, Mrs. Swift, can Jonathan come out and play?) It may be that nematodes can only cause disease in humans if the worms are infected with the Wolbachia bacteria. And now we find that Wolbachia's behavior depends on its own level of infection with a bacteriophase. Just like the recession from molecules to atoms to protons to quarks to strings: "It may be possible that the viral parasite of the bacterial parasite of the nematode parasite affects the course of a human disease."