All

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 B04 Viruses D014780 +
  B04.820 RNA Viruses D012328 +
   B04.820.504 Nidovirales D028381 +
    B04.820.504.080 Arteriviridae D028382 +
     B04.820.504.080.100 Arterivirus D018018 +
      B04.820.504.080.100.700 Porcine respiratory and reproductive syndrome virus D019316 
 B04 Viruses D014780 +
  B04.909 Vertebrate Viruses D014712 +
   B04.909.777 RNA Viruses D012328 +
    B04.909.777.500 Nidovirales D028381 +
     B04.909.777.500.080 Arteriviridae D028382 +
      B04.909.777.500.080.500 Arterivirus D018018 +
       B04.909.777.500.080.500.800 Porcine respiratory and reproductive syndrome virus D019316