The time needed for viral replication

The number of new virions released per infected cell

The amount of virus needed to infect 50% of cells

The number of cells infected

host cell's ability to phagocytize viral particles

enzymatic activity of a host cell

type of viral nucleic acid

Viruses are entering cells

Mature virions are being released from the cell

Viruses are being inactivated by the immune system

Viral components are being synthesized, but no complete virions are present

replication of viral nucleic acid

adsorption to specific receptors

injection of naked nucleic acid into the host cell

assembly of viral components

Synthesis of DNA from an RNA template

Synthesis of double-stranded RNA from an RNA template

Synthesis of double-stranded RNA from a DNA template

Synthesis of DNA from a DNA template

Viruses contain DNA or RNA but never both.

Viruses use the anabolic machinery of the cell.

Viruses use their own catabolic enzymes.

Viruses contain a protein coat.

release

penetration

biosynthesis

Time when viruses are detectable in the bloodstream

Time when viruses attach to host cells

Time when viruses are actively budding from the host cell

Time from entry to FIRST appearance of extracellular viruses