[viruses]
   Order Herpesvirales
     Family Herpesviridae
       Subfamily Betaherpesvirinae
         1 Genus Cytomegalovirus
         2 Genus Muromegalovirus
         3 Genus Proboscivirus
         4 Genus Roseolovirus
         5 Caviid betaherpesvirus 2
         6 Tupaiid betaherpesvirus 1