All

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 G03 Environment and Public Health D004778 +
  G03.850 Public Health D011634 +
   G03.850.310 Disease Transmission D018562 +
    G03.850.310.300 Disease Transmission, Horizontal D018446 +
      G03.850.310.300.330 Disease Transmission, Professional-to-Patient D017757 
      G03.850.310.300.320 Disease Transmission, Patient-to-Professional D017758