Relapsing fever, a rare disease in Saudi Arabia

ABSTRACT

Background: relapsing fever is an acute febrile illness caused by blood spirochetes belonging to genus borrelia. This spirochete can be acquired through the bite of an infected soft tick [Ornithodoros species] or contact with an infected louse [Pediculus humanus] and thus constituting two types of relapsing fever [RF] depending upon the responsible vector i.e. Tick borne relapsing fever [TBRF] and Louse-borne relapsing fever [LBRF]. It is characterized by recurrent cycles of pyrexia which are separated by intervals of apparent recovery. During pyrexia, organisms are found in blood. While during afebrile period, organisms hide themselves in spleen, liver and even central nervous system