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.
Diagrammatic illustration of fitness differences in pairwise competitions between studied clones. For any pairwise competition, calculation of fitness difference (WD) used the fitter virus in the numerator. Arrows point to isolates with lower fitness. Large arrows, WD > 20; small arrows, WD = 2–20; double lines, WD = 1–2; ND, not determined. (a) Fitness relationships between subtype B clones in the study. (b) Fitness relationships between subtype C clones in the study.
