A rare cause of fever of unknown origin in India.

In India, tuberculosis, lymphoma and adult onset Still's disease are the commonly reported causes of fever of unknown origin (FUO). We describe a case of an immunocompetent adult male patient who presented with FUO and anemia. He developed lymphadenopathy after 8 days of admission, for which further workup was done. His bone marrow aspirate showed pure red cell hypoplasia, for the evaluation of which, parvovirus-B19 (B19V) antibodies were ordered which came back positive. He was treated with a short course of steroids and on follow-up showed complete resolution of symptoms.