"The order Nidovirales consists of viruses which have positive-sense, single-stranded RNA genomes. As positive-sense genomes, the viruses can use some host cell proteins during replication and gene expression which occurs in the cytoplasm of the host cell."

Nidovirales

"The (+)ssRNA viruses are classified into three orders—the Nidovirales, Picornavirales, and Tymovirales—and 33 families, of which 20 are not assigned to an order. A broad range of hosts can be infected by (+)ssRNA viruses, including bacteria (the Leviviridae), eukaryotic microorganisms, plants, invertebrates, and vertebrates."

University of Michigan - Ann Arbor

"A virus that uses positive sense single stranded RNA as its genetic material. Single stranded RNA viruses are classified as positive or negative depending on the sense or polarity of the RNA. The positive-sense viral RNA genome can serve as messenger RNA and can be translated into protein in the host cell."

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