setracovirus setracovirus setracovirus is a subgenus of viruses in the genus alphacoronavirus. setracovirus virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: pisoniviricetes order: nidovirales family: coronaviridae genus: alphacoronavirus subgenus: setracovirus species human coronavirus nl63 nl63-related bat coronavirus strain btkynl63-9b