[FUO (fever of unknown origin) as a presenting sign of West Nile fever].

West Nile fever is an infection affecting thousands of people each year, and is responsible for a wide spectrum of clinical manifestations from a mild febrile illness to lethal encephalitis. The prevalence of this infection and its associated morbidity has risen dramatically in recent years. We present a patient with non-specific complaints and prolonged fever for 7 weeks. He underwent thorough investigation, which almost ended with abdominal laparoscopy until the final diagnosis of West Nile Fever was established.