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Treponema is a Gram-negative Spirochaete. T. pallidum is the cause of syphilis. All spirochaetes have an axial filament which gives them a characteristic corkscrew appearance and helps them to move through viscous mucus.
Domain Bacteria
Phylum Spirochaetes
Class Spirochaetes
Bergey's Manual Volume 5: The Planctomycetes, Spriochaetes, Fibrobacteres, Bacteriodetes and Fusobacteria