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.
The expected virulence after a single round of host-to-host transfer, starting at the deterministic mutation–selection balance distribution, for the vertical transmission model. Curves correspond to bottleneck sizes of 1, 2, 3, and 4. Horizontal line gives the mean virulence at the deterministic mutation-selection balance.
