from Section 5 - Bacterial Infections
Published online by Cambridge University Press: 18 June 2025
Relapsing fevers are caused by Borrelia spirochaetes. Louse-borne relapsing fever (LBRF), which is caused by Borrelia recurrentis and has epidemic potential, is transmitted only between humans by body lice, whereas tick-borne relapsing fever (TBRF), classically caused by Borrelia duttoni, is an endemic zoonosis. Though morphologically indistinguishable, genomic comparisons suggest B. recurrentis evolved from B. duttoni, undergoing genome reduction during restriction to the human-louse life cycle (Lescot et al. 2008). Both harbour linear mega-plasmids with a large repertoire of variant lipoproteins, responsible for immune evasion and immunopathogenesis. Despite biological similarities, LBRF and TBRF differ in clinical manifestations and disease control measures.
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