title: Investigation probes risk of contracting West Nile virus via blood transfusions.
mesh_terms: D001782:Blood Donors; D001803:Blood Transfusion; D016358:Contact Tracing; D006801:Humans; D016377:Organ Transplantation; D012306:Risk; D014481:United States / Q000453:epidemiology; D014901:West Nile Fever / Q000453:epidemiology / Q000517:prevention & control / Q000635:transmission*