Urine and serum specimens from onco-haematological patients including acute myeloid leukemia (AML), acute lymphoid leukemia (ALL), multiple myeloma (MM), Hodgkin lymphoma (HL), non-Hodgkin lymphoma (NHL) and hairy cell leukemia (HCL) with confirmed febrile neutropenia were examined for presence of mip gene of L. pneumophila by PCR. The gene discussed is MIP; the disease is acute lymphoblastic leukemia.