Nidovirales

Nidovirales is an order of viruses with animal and human hosts. It includes the families Coronaviridae, Arteriviridae, Roniviridae and Mesoniviridae. The order Nidovirales is named for the Latin nidus, meaning nest, as all viruses in this order produce a 3' co-terminal nested set of subgenomic mRNA's during infection.