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RNA virus
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An RNA virus is a virus—other than a retrovirus—that has ribonucleic acid as its genetic material. The nucleic acid is usually single-stranded RNA but it may be double-stranded.
Wikipedia
Representative species
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Coronavirus
Respiratory syncytial virus
Picornavirus
West Nile virus
Filoviridae
Hepatitis A virus
Vaccinia virus
Lassa mammarenavirus