Absence of bone marrow amastigotes in a child with kala-azar and acute lymphoblastic leukaemia.

Visceral leishmaniasis is suspected on the basis of clinical findings and a pancytopenic blood picture and is usually confirmed by the detection of amastigotes (Leishman-Donovan bodies) in a bone marrow aspirate. We describe a child on maintenance treatment for acute lymphoblastic leukaemia who developed visceral leishmaniasis and in whom amastigotes could not be detected in repeated bone marrow aspirates. Immunofluorescence antibody testing was positive. Immunocompromised patients in endemic areas who develop features of visceral leishmaniasis should have serological tests performed in addition to bone marrow aspiration in order to maximize the chances of making a diagnosis.