Cytoplasmic viral factories are inclusions which form from concentrating of the replication machinary of RNA viruses. These inclusions favor enzymatic activities and protect the viral from getting recognized by the cellular receptors (30181255).
Heinrich BS, Maliga Z, Stein DA, Hyman AA, Whelan SPJ. Phase Transitions Drive the Formation of Vesicular Stomatitis Virus Replication Compartments. mBio. 2018 Sep 4;9(5):e02290-17. doi: 10.1128/mBio.02290-17. PMID: 30181255; PMCID: PMC6123442.