Spirillum

**Definition:** A genus of gram-negative, curved and spiral-shaped bacteria found in stagnant, freshwater environments. These organisms are motile by bipolar tufts of flagella having a long wavelength and about one helical turn. Some species of Spirillum cause a form of RAT-BITE FEVER.

**Tree numbers:** - B03.440.840.750 - B03.660.075.710.750