[viruses]
   Realm Riboviria
     Order Nidovirales
       Suborder Cornidovirineae [monotypic]
         Family Coronaviridae
           Subfamily Orthocoronavirinae
             Genus Betacoronavirus
               Subgenus Embecovirus
                 1 Betacoronavirus 1
                 2 China Rattus coronavirus HKU24
                 3 Human coronavirus HKU1
                 4 Murine coronavirusᵀ