All

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 E02 Therapeutics D013812 +
  E02.095 Biological Therapy D001691 +
   E02.095.520 Immunotherapy D007167 +
    E02.095.520.400 Immunization D007114 +
     E02.095.520.400.650 Mass Immunization D032541 
 E05 Investigative Techniques D008919 +
  E05.478 Immunologic Techniques D007158 +
   E05.478.550 Immunization D007114 +
    E05.478.550.650 Mass Immunization D032541 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.780 Public Health Practice D015980 +
    G03.850.780.200 Communicable Disease Control D003140 +
     G03.850.780.200.425 Immunization D007114 +
      G03.850.780.200.425.449 Mass Immunization D032541 
 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.780 Public Health Practice D015980 +
    G03.850.780.680 Primary Prevention D011322 +
     G03.850.780.680.310 Immunization D007114 +
      G03.850.780.680.310.444 Mass Immunization D032541 
 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.421 Health Services D006296 +
   N02.421.143 Community Health Services D003153 +
    N02.421.143.827 Preventive Health Services D011314 +
     N02.421.143.827.608 Immunization Programs D017589 +
      N02.421.143.827.608.500 Mass Immunization D032541 
 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.421 Health Services D006296 +
   N02.421.726 Preventive Health Services D011314 +
    N02.421.726.608 Immunization Programs D017589 +
     N02.421.726.608.500 Mass Immunization D032541 
 N02 Health Care Facilities, Manpower, and Services D005159 +
  N02.421 Health Services D006296 +
   N02.421.726 Preventive Health Services D011314 +
    N02.421.726.758 Primary Prevention D011322 +
     N02.421.726.758.310 Immunization D007114 +
      N02.421.726.758.310.444 Mass Immunization D032541