• La Crosse Encephalitis (LAC)
  • Lassa Fever
  • LCM (Lymphocytic Choriomeningitis)
  • Legionnaires’ Disease [Legionellosis]
  • Leishmania Infection [Leishmaniasis]
  • Leprosy
  • Lockjaw — see Tetanus Disease
  • Lou Gehrig’s Disease — see ALS
  • LUHF (Lujo Hemorrhagic Fever)
  • Lupus (SLE) [Systemic lupus erythematosus]
  • Lyme Disease [Borrelia burgdorferi Infection]
  • Lymphatic Filariasis
  • Lymphedema