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.
Average strain lifetime as a function of the cross-immunity parameter a for a genotype with seven loci and three alleles. R0 is taken to be (a,b) 2, (c,d) 4 and (e) 6. Maximum cross-immunity value, b, is 0.95 in all the cases. Results for a recovery rate of (a,b) σ=50 per year and (c–e) for σ=100 per year are shown (population size: blue dots, 1 000 000 000; red dots, 300 000 000; green dots, 90 000 000).
