Relapsing Fever - Infection - Tick-borne Relapsing Fever

Tick-borne Relapsing Fever

Tick-borne relapsing fever is found primarily in Africa, Spain, Saudi Arabia, Asia in and certain areas of Canada and the western United States.

Other relapsing infections are acquired from other Borrelia species, which can be spread from rodents, and serve as a reservoir for the infection, via a tick vector.

  • Borrelia crocidurae - occurs in Egypt, Mali, Senegal, Tunisia; vectors - Ornithodoros erraticus, Ornithodoros sonrai; animal host - shrew (Crocidura stampflii)
  • Borrelia duttoni, transmitted by the soft-bodied African tick Ornithodoros moubata, is responsible for the relapsing fever found in central, eastern and southern Africa.
  • Borrelia hermsii
  • Borrelia hispanica
  • Borrelia miyamotoi
  • Borrelia parkeri

Borrelia hermsii and Borrelia recurrentis cause very similar diseases. However, one or two relapses are common with the disease associated with Borrelia hermsii which is also the most common cause of relapsing disease in the United States. (Three or four relapses are common with the disease caused by B. recurrentis. B. recurrentis has longer febrile and afebrile intervals and a longer incubation period than Borrelia hermsii.)

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