andecovirus andecovirus andecovirus is a subgenus of viruses in the genus deltacoronavirus, consisting of a single species, wigeon coronavirus hku20. wigeon coronavirus hku20 virus classification (unranked): virus realm: riboviria kingdom: orthornavirae phylum: pisuviricota class: pisoniviricetes order: nidovirales family: coronaviridae genus: deltacoronavirus subgenus: andecovirus species: wigeon coronavirus hku20