All

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 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 +
      G03.850.780.200.300 Fumigation D005651 
      G03.850.780.200.400 Handwashing D006235 
      G03.850.780.200.425 Immunization D007114 +
      G03.850.780.200.650 Pest Control D010571 +
      G03.850.780.200.800 Sanitation D012499 
      G03.850.780.200.225 Contact Tracing D016358 
      G03.850.780.200.925 Universal Precautions D016635 
      G03.850.780.200.450 Infection Control D017053 +
      G03.850.780.200.262 Disease Notification D018563 
      G03.850.780.200.550 Mandatory Testing D018580