FIG. 2.

Relative infectivities of ARV-176 and ARV-138 in macrophages versus fibroblasts. Both viruses were serially diluted and used to infect monolayers of QM5 fibroblasts (gray bars). Virus dilutions that gave equivalent numbers of foci of infection in QM5 cells were similarly used to infect HD-11 macrophages (black bars). Infected monolayers were immunostained to detect viral foci of infection as described for Fig. 1. The average number of foci of infection per field at a magnification of ×100 was determined after correcting for the relative virus dilution, as described in Materials and Methods. Results are presented as means and standard errors from a representative experiment.