Figure 2.

Latent infection: human papilloma virus initially infects the nucleus of basal cells. Few viral DNA are synthesized in infected cells. Latent infection is the ability of a pathogenic virus to lie dormant within cells (a type of persistent viral infection) but virus production ceases. Lytic infection: numerous viral DNA are synthesized in the nuclei of cells in the upper layer with virions released from the superficial cell layer. Lytic infection is virus beginning to produce large amounts of viral progeny and to release viral particles to destroy the infected cells.