Viruses can use the host cell to copy themselves and make viral proteins.
How do viruses multiply in humans?
Once within the body of the host, a virus moves along the cell surfaces until its proteins start to interact with the receptors on the cells. Once the virus and cells have fused, the virus' DNA or RNA can now enter the cells and start reproducing there. Viruses can't multiply on their own; instead, they rely on the protein synthesis pathways of their host cell to do it. This normally happens as a result of the virus inserting its genetic material in host cells, co-opting the proteins to generate viral replicates, and eventually causing the cell to burst due to the high volume of new viral particles.
Hence, the answer is viruses can use the host cell to copy themselves and make viral proteins.
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