Viruses: Cell Biology and Virus-Host Interactions - Hardcoverby Kristin Allen (Editor) Viruses are intracellular parasites that are found in all types of life forms, from plants and animals to prokaryotes and archaebacteria. These obligate infectious agents subvert various essential molecular and cellular processes of the host cell. Viruses exploit host cells to replicate and proliferate from cell to cell and from host to host, which leads to an increase in their own population within the host. Infection begins