All

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 C01 Bacterial Infections and Mycoses D001423 +
  C01.252 Bacterial Infections D001424 +
   C01.252.400 Gram-Negative Bacterial Infections D016905 +
    C01.252.400.500 Legionellosis D007876 +
      C01.252.400.500.501 Legionnaires' Disease D007877 
 C08 Respiratory Tract Diseases D012140 +
  C08.730 Respiratory Tract Infections D012141 +
   C08.730.382 Legionellosis D007876 +
     C08.730.382.380 Legionnaires' Disease D007877