They all contain very large genomes for RNA viruses, with some viruses having the largest identified RNA genomes, containing up to 33.5 kilobase (kb) genomes. The viruses were initially sorted into these genera based on serology but are now divided by phylogenetic clustering.Īll viruses in the Nidovirales order are enveloped, non-segmented positive-sense RNA viruses. The Coronavirinae are further subdivided into four genera, the alpha, beta, gamma, and delta coronaviruses. The Coronavirinae comprise one of two subfamilies in the Coronaviridae family, with the other being the Torovirinae. Coronaviruses (CoVs) are the largest group of viruses belonging to the Nidovirales order, which includes Coronaviridae, Arteriviridae, Mesoniviridae, and Roniviridae families.
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