Spirochetes are not only nasty pathogens. Most of these bacteria exist as free-living microorganisms but there are much less studied than the pathogens.
Reference cited in this video:
STEPHENS E.A., BRAISSANT O. & VISSCHER P.T. (2008).- Spirochetes and salt marsh microbial mat geochemistry: Implications for the fossil record.- Carnets de Géologie / Notebooks on Geology, Brest, Article 2008/09 (CG2008_A09)
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