Permalink Download Comment Return to top On this page Louse-borne relapsing fever (LBRF) Tick-borne relapsing fever (TBRF) Relapsing fever (FR) is caused by spirochetes of the genus Borrelia, transmitted to humans by arthropod vectors. Path Book traversal links for Relapsing fever (borreliosis) Leptospirosis Louse-borne relapsing fever (LBRF)