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.
Variant fitness of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants. Shown is “mutational”/variant-level fitness measured by the increase in average transmission for different SARS-CoV-2 variants colored by clade relative to an early 2020 genotype: Wuhan-Hu-1 (Obermeyer et al. 2021). (Analysis and image reprinted from Nextstrain.org [nextstrain.org/ncov/gisaid/global] under an Attribution 4.0 International (CC-BY-4.0) license.)
