title: US in grip of West Nile virus.
mesh_terms: D000818:Animals; D006801:Humans; D016377:Organ Transplantation / Q000009:adverse effects; D065227:Transfusion Reaction; D014481:United States / Q000453:epidemiology; D014901:West Nile Fever / Q000175:diagnosis / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission; D014902:West Nile virus / Q000276:immunology / Q000472:pathogenicity*