After binding to host cell receptors, animal viruses enter the host cell either via endocytosis, where the host cell engulfs the virus, or through membrane fusion, where the viral envelope merges with the host cell membrane.

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Lytic animal viruses follow similar infection stages to bacteriophages: attachment, penetration, biosynthesis, maturation, and release But the mechanisms of penetration, nucleic-acid biosynthesis, and release differ from bacterial viruses in that animal viruses enter through endocytosis, and utilize tissue tropism

Animal Replication

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The virus attaches to the specific host cell receptor within specific tissues of the host using tissue tropism.

Attachment of Animal Viruses

During the replication of animal viruses in eukaryotic host cells, the site of genomic replication depends on the nucleic acid type: most DNA viruses replicate their genomes within the cell nucleus, whereas most RNA viruses replicate within the cytoplasm.

Nucleic acid biosynthesis of Animal Viruses

Penetration of Animal Viruses

The viral mRNA is assembled to produce viral proteins. 

Maturation of Animal Viruses

The viral particles are relased in to the extraceullar environement from the host cell which is not destroyed in the process so that it can continue making new viral particles for infection. 

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