FIG. 2.

One-step growth analysis of chimeric viruses in BHK cells. BHK cells were infected with the indicated virus at a MOI of 1. The medium over the cells was replaced every 30 min for the first 2 h and then every hour for 12 h postinfection. Supernatant was collected at the indicated times and assayed for released virus by titration on BHK cell monolayers at 37°C. Values are averages from two independent experiments.