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.
Time dependence of the prevalence-weighted number of co-circulating strains (blue curve) and strain extinction rate (red curve). Both graphs are for 300 million population, R 0=2, b=0.9 and a genotype of six loci and three alleles. Recovery rates of (a) σ=50 per year and (b) σ=100 per year.
