Discussion
A virus is naked, icosahedral, acid-resistant and spreads by the faecal-oral route. It is most likely
Answer: A
Correct answer: an enterovirus
Take the properties in turn: naked and icosahedral makes it a picornavirus; acid resistance excludes the rhinoviruses and the aphthoviruses, both of which are destroyed at low pH; and the faecal-oral route requires a virus that survives the stomach. Only the enteroviruses satisfy all three, and acid stability is precisely what defines the genus.
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