Relapsing fever, a rare disease in Saudi Arabia

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

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Methods: one hundred and thirteen patients presenting with high grade fever were studied for disease pattern. They underwent routine and special investigations for meningitis, malaria, dengue, enteric fever, HBV, HCV and HIV on quality control maintained analyzers by standard methods

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Results: all the 113 patients after diagnosis were classified as enteric fever [41], malaria [37], meningitis [20], dengue fever [14] and a patient of relapsing fever i.e. Borrelia recurrentis. This patient was brought in unconscious state, looked jaundiced, dehydrated, had hepatosplenomegaly. His CBC showed WBC 10. 7X1 0A9/L, Hb 10.5g/dl, Platelet count 35x10"9/1. Giemsa stained blood film showed multiple number of spiral shaped organisms- borrelia recurrentis. He had signs of splenic rupture; he underwent splenectomy. Histopathology of spleen for spirochetes confirmed spiral shaped organisms [borrelia recurrentis]

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Conclusions: there is very little information about borrelia infection in Saudi Arabia. The prevalence or incidence in Saudi Arabia is unknown. Its apparent rarity may be due to under diagnosis and under reporting. A high index of suspicion in appropriate clinical situations will lead to its early recognition and treatment