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Bookmark or Share- About Tick and Louse-borne Relapsing FeversRelapsing fever is an illness characterized by one or more episodes of fever, headache, and muscle pain that lasts several days and is separated by roughly a week of feeling well. Relapsing fever is caused by several species of Borrelia bacteria, which are distantly related to the bacteria that cause Lyme disease.
- Epidemiology of Tick-Borne Relapsing Fever in Endemic Area, SpainTick-borne relapsing fever (TBRF) is a zoonosis caused by spirochetes of the genus Borrelia. The arthropod vector is a soft tick of the genus Ornithodoros, which is endemic to America, Africa, Asia, the Near East and Middle East, and the Iberian Peninsula in Europe .
- About Hard Tick Relapsing Fever (HTRF)Hard tick relapsing fever (HTRF) is caused by Borrelia miyamotoi bacteria and transmitted to people through the bites of infected blacklegged ticks, Ixodes scapularis, and western blacklegged ticks, I. pacificus. Evidence suggests that HTRF most commonly involves a single episode of fever.
- About Soft Tick Relapsing Fever (STRF)The term "soft tick relapsing fever" helps differentiate relapsing fever transmitted by soft ticks (caused by Borrelia hermsii, B. turicatae, and other Borrelia species) from relapsing fever transmitted by hard ticks (caused by B. miyamotoi and possibly other species).
- Clinical Guidance for Soft Tick Relapsing Fever (STRF)Relapsing fever bacteria Borrelia bacteria that cause relapsing fever have a unique process of DNA rearrangement. This process, called antigenic variation, allows the spirochete to evade the host immune system and cause relapsing episodes of fever and other symptoms.
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