FIG. 1.
Decrease of infectivity of C. psittaci after exposure of infected HEp-2 cell cultures to different amounts of persistence-inducing reagents. The number of inclusion-forming units was determined from methanol-fixed immunostained cell cultures at 48 h p.i. (A) Iron depletion by addition of DAM. (B) Penicillin G treatment. (C) Exposure to IFN-γ.