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Discussion

The classification of viruses rests principally on

  • A.the geographical area of first isolation
  • B.the size of the host organism
  • C.genome type, organisation and mode of replication
  • D.the disease produced in humans

Answer: C

Families are defined by whether the genome is DNA or RNA, single or double stranded, linear or circular, monopartite or segmented, together with how it is replicated and where the capsid is assembled. Clinical syndrome is a poor guide, since unrelated viruses cause similar illnesses.

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