I read all spirochetes have a flagella.
Isn't that how they 'swim'?
FWIW - here is a wikipedia article about
it:
/en.wikipedia.org/wiki/Spirochaete"Spirochaetes are distinguished from other bacterial phyla by the
location of their flagella, sometimes called axial filaments, which run lengthwise between the bacterial inner membrane and outer membrane in periplasmic space. These cause a twisting motion which allows the spirochaete to move about
."
www.encyclopedia.com/science-and-technology/biology-and-genetics/cell-biology/spirochetes"Besides their shape, another distinctive aspect of spirochetes in the presence of what is essentially internal flagella. These structures, called axial filaments, are embedded in the cell wall of the bacterium. They are constructed very similarly as flagella, having the characteristic arrangement of structures that anchors the filament to the cell membrane. There can be only a few to as many as 200 axial filaments present in a given bacterium. The rigidity of an axial filament allows a bacterium to move in a corkscrew type of motion. Axial filaments are present in all spirochetes except Treponema."
"In terms of human health, spirochetes are noteworthy because of the disease causing members of the group. Treponema pallidum is the cause of syphilis and Borrelia burgdorferi is the cause of Lyme disease, which can produce a chronic infection that can result in arthritis, damage to the central nervous system, and even heart failure. Borrelia burgdorferi can convert to a metabolically dormant cyst in natural environments and even in humans. The cyst form allows the bacterium to survive inhospitable conditions and to elude host immune defense mechanisms."