Most animal viruses live in harmony with their natural hosts and do not cause serious illness. If the virus infects an unnatural host, a serious disease may result. The various kinds of relationships of animal viruses with their hosts are in general similar to those seen with bacterial viruses and bacteria. Replication of viral nucleic acid depends to varying degrees on the enzymes of nucleic acid replication of the host cells.
A retrovirus, HIV, is responsible for the disease AIDS, which has features of a latent, chronic, and slow infection. The replication of HIV involves an enzyme,
Nester-Anderson-Roberts: I II. The Microbial World I 14. Viruses, Prions, and I I © The McGraw-Hill
Microbiology, A Human Viroids: Infectious Agents Companies, 2003
Perspective, Fourth Edition of Animals and Plants
Host plasma membrane with receptors
Loss of envelope; nucleocapsid in host cytoplasm;
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