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Chapter 25, Problem 2MC

What do viruses in the families Picornaviridae, Caliciviridae, Astroviridae, Coronaviridae, Togaviridae, Flaviviridae, and Retroviridae have in common?

  1. a. They are arboviruses.
  2. b. They are nonpathogenic.
  3. c. They have positive single-stranded RNA genomes.
  4. d. They have negative single-stranded RNA genomes.
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