''Spirillum minus'' is an organism associated with

rat-bite fever Rat-bite fever (RBF) is an acute, febrile human illness caused by bacteria transmitted by rodents, in most cases, which is passed from rodent to human by the rodent's urine or mucous secretions. Alternative names for rat-bite fever include stre ...

(specifically sodoku) that has never been fully identified and was assigned to the genus ''

Spirillum ''Spirillum'' is a genus of Gram-negative bacteria in the family ''Spirillaceae'' of the ''Nitrosomonadales'' of the ''Betaproteobacteria''.Garrity, George M.; Brenner, Don J.; Krieg, Noel R.; Staley, James T. (eds.) (2005). Bergey's Manual of ...

'' in 1887 based on morphology, although it is not a validly published name. As ''

'' species generally obligately microaerophiles and are not found in mammals, this organism may be misclassified. Sequencing data should help to resolve this question. This organism is presumed to be a bacterium. It stains

gram-negative Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wa ...

and has a coiled rod shape. It does not grow ''in vitro'', and requires inoculation in animals for growth. No attempts to sequence the organism are known as of 2015.

References

{{Taxonbar, from=Q7577829 Nitrosomonadales