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 whole genome sequencing surveillance identified the 2021 spring break transmission event. Generalized clade names are denoted by different colors, and the prevalence of each clade is indicated proportionally by the surface area of the block.
