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Respiratory CAS Practice Exam

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Rhinovirus belongs to which virus family?
Correct Answer:
Picornaviridae
Explanation:
Classification by genome type and envelope status is what spots rhinoviruses in Picornaviridae. Rhinoviruses are small, non-enveloped viruses with a positive-sense single-stranded RNA genome and an icosahedral capsid. This combination—non-enveloped, +ssRNA, and small genome—is characteristic of Picornaviridae, which also includes poliovirus and other enteroviruses. The other families differ in these key features: some are enveloped, some are DNA viruses, and their genome organization doesn’t match rhinoviruses. So rhinovirus belongs to Picornaviridae.

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