. "The process that occurs after viral attachment by which a virion, or viral nucleic acid, breaches the plasma membrane or cell envelope and enters the host cell. The process ends when the viral nucleic acid is released into the host cell cytoplasm." . . . "viral entry into host cell" . "entry of virus into host cell" . "phage translocation" . "viral penetration" . "virion penetration" . "virion penetration into host cell" . . . . . . .