Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Serial virus passage in active and quiescent HFF. Quiescent (A) and active (B) HFF were infected with 5 PFU per cell of WR or indicated mutant virus. After 24 h, the cells were harvested and 10% of the lysate used to infect fresh quiescent or active HFF. The procedure was repeated for a total of 7 serial infections. Experiments were carried out in triplicate. Average titers are shown and bars represent the standard error of the mean.
