What is a genus of Spirobacteria similar to Spirillum, but distinguished by its motility. One species, the Spirochæte Obermeyeri, is supposed to be the cause of relapsing fever called?

spirochaeta — A genus of Spirobacteria similar to Spirillum, but distinguished by its motility. One species, the Spirochæte Obermeyeri, is supposed to be the cause of relapsing fever. (Webster's 1913.)

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