host cell part viral factory 2013-12-19T14:53:47Z cellular_component VZ:1951 bf virus factory GO:0039713 An intracellular compartment in a host cell which increases the efficiency of viral replication, and shields the virus from host defenses. Viral factories can be either cytoplasmic or nuclear and often arise from extensive rearrangement of host cell cytoskeletal and/or cell membrane compartments.