[Chronic infection of Acholeplasma laidlawii by a group L 1 mycoplasma virus].

Mycoplasma virus MVL 51, of the group L1 of Gourlay, has been shown to induce a chronic cell infection of two reference strains (1305/68 and JA 1) of Acholeplasma laidlawii. Titers of virus and cells remain at a fairly high level during infection, around 10(8) units/mL, with a mean ratio of approximately 1 PFU/1 CFU, as under control of a regulation mechanism. However, sudden spontaneous variations in the virus level do occur, from time to time, thus suggesting transient regulation breaks but not impairing the pattern of a more extensive regulation cycle.