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Which of the following RNA virus families include the smallest viral pathogens in animals? Arenaviridae Paramyxoviridae...

Which of the following RNA virus families include the smallest viral pathogens in animals?

Arenaviridae

Paramyxoviridae

Rhinoviridae

Coronaviridae

Picornaviridae

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Answer #1

Answer: Picornaviridae

  The Picornaviridae is a family of small, icosahedral viruses with single-stranded, highly diverse positive strand RNA genomes. Characteristic features of all members of the family are three capsid proteins with b-barrel folding, polyprotein processing by virus-encoded cysteine proteinase(s), and replication by an RNA-dependent RNA polymerase with YGDD sequence motif. The family comprises 35 genera containing 80 species, but many viruses are presently awaiting classification. Picornaviruses may cause subclinical infections of humans and animals or conditions ranging from mild febrile illness to severe diseases of heart, liver and the central nervous system.

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