: They have internal flagella (axial filaments) that allow them to move in a corkscrew motion through thick environments like blood and tissue.
Untreated Borrelia infections typically progress through three stages: Borrelia Burgdorferi - StatPearls - NCBI Bookshelf - NIH
: Borrelia are "masters of disguise," changing their outer surface proteins to hide from the host's immune system as they move between ticks and mammals. Clinical Stages of Infection
