Lytic cycle of T4, a virulent phage.

A lytic phage such as T4 leads to the death of the host when progeny phages burst (lyse) the host cell; such a phage is considered virulent.

This T4 phage uses its tail fibers to bind to receptor sites on the surface of an E. coli cell.

One of the first phage genes translated after the viral DNA enters the host cell codes for an enzyme that degrades the host DNA.