Spirillum

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Spirillum (plural Spirilla) is any bacterium that is shaped like a spiral. It is one of the three shapes of bacteria. The other two are Coccus and Bacillus.

Spirillum is also the name of a genus of Gram-negative bacteria in the family Spirillaceae. The two species in the Spirillum genus are Spirillum minus and Spirillum pulli.