The virus is continually present in the body and is referred to as persistent. Option D.
Viruses don't breathe. Also, they do not grow or multiply by themselves. Viruses need living cells to reproduce. A living cell in which a virus grows is called a host cell. When the virus is present in the body but remains dormant without producing any more viruses.
Latent viral infections usually do not cause obvious symptoms and can take a long time to become active and cause symptoms. This is because viruses do not have the cellular machinery necessary for replication and hijack living cells. Another aspect that keeps viruses on the line between living and non-living is their ability to crystallize.
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