Spirochaetes (or Spirochetes) are the phylum Spirochaetae. These are double-membrane bacteria with long, helically coiled (spiral-shaped) cells.
Spirochaetes are bacteria. They have flagella, which run lengthwise between the cell wall and outer membrane. The flagella cause a twisting motion which moves the spirochaete about.
Most spirochaetes are free-living and anaerobic, but there are many parasitic species.
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