"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."

Taxonomic distribution of (+)ssRNA

"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."

University of Michigan - Ann Arbor

This system classifies viruses into families based on their genome type (DNA, RNA, single-stranded (ss), double-stranded (ds), etc.) and method of replication.
Viruses in each category behave similarly.
1. dsDNA viruses (e.g. Adenoviruses, Herpesviruses, Poxviruses)
2. ssDNA viruses (+ strand or "sense") DNA (e.g. Parvoviruses)
3. dsRNA viruses (e.g. Reoviruses)
4. (+)ssRNA viruses (+ strand or sense) RNA (e.g. Coronaviruses, Picornaviruses, Togaviruses)
5. (−)ssRNA viruses (− strand or antisense) RNA (e.g. Orthomyxoviruses, Rhabdoviruses)
6. ssRNA-RT viruses (+ strand or sense) RNA with DNA intermediate in life-cycle (e.g. Retroviruses)
7. dsDNA-RT viruses DNA with RNA intermediate in life-cycle (e.g. Hepadnaviruses)

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