[viruses]
   Realm Riboviria
     Order Nidovirales
       Suborder Cornidovirineae [monotypic]
         Family Coronaviridae
           Subfamily Orthocoronavirinae
             Genus Alphacoronavirus
               Subgenus Setracovirus
                 1 Human coronavirus NL63
                 2 NL63-related bat coronavirus strain BtKYNL63-9b