FIG. 1.

Cell growth experiments demonstrating the growth-inhibitory effect of UV-inactivated HCMV. Cultures of preconfluent HF cells were mock infected, infected with HCMV at a multiplicity of 5 PFU/cell, or infected with a quantity of UV-inactivated HCMV equivalent to 5 PFU/cell prior to its inactivation. (A) At different times after infection, cells were collected by trypsinization and counted with a hemacytometer. The av mean of triplicate determinations is presented. (B) Preconfluent HF cells were mock infected or infected as described above and photographed at 53 h after infection.