parasitic or free-living bacteria; many pathogenic to humans and other animals 同义词：spirochete,
Spirochaetes (also spelled spirochetes) belong to a phylum of distinctive diderm (double-membrane) bacteria, most of which have long, helically coiled (spiral-shaped) cells. Spirochaetes are chemoheterotrophic in nature, with lengths between 5 and 250??m and diameters around 0.
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