All

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 C02 Virus Diseases D014777 +
  C02.782 RNA Virus Infections D012327 +
   C02.782.815 Retroviridae Infections D012192 +
    C02.782.815.616 Lentivirus Infections D016180 +
     C02.782.815.616.900 Visna D016182 
 C02 Virus Diseases D014777 +
  C02.839 Slow Virus Diseases D012897 +
   C02.839.900 Visna D016182 
 C22 Animal Diseases D000820 +
  C22.836 Sheep Diseases D012757 +
   C22.836.900 Visna D016182