Spirillum minus
Spirillum minus is an organism associated with rat-bite fever ( specifically sodoku ) that has never been fully identified and was assigned to the genus "Spirillum" in 1887 based on morphology , although it is not a validly published name . 
<triplet> Spirillum minus <subj> sodoku <obj> has effect <triplet> sodoku <subj> rat-bite fever <obj> subclass of