The cryptogenic factor in λ

Release of a Group 1 Mycoplasma Virus from Acholeplasma laidlawii After Treatment with Mitomycin C

“…This event is similar to "cryptic lysogeny," a phenomenon by which viruses can be carried by a cell without conferring immunity to infection by homologous viruses. Typically, cryptic lysogeny is found in some coliphage mutants (1,14) or with wild-type phages of Achromobacter (19) and Proteus mirabilis (7).…”