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What you should know:

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 4: The Bacteroidetes, Spirochaetes, Tenericutes (Mollicutes), Acidobacteria, Fibrobacteres, Fusobacteria, Dictyoglomi, Gemmatimonadetes, Lentisphaerae, Verrucomicrobia, Chlamydiae, and Planctomycetes