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.
In the tree, asterisks indicate co-circulating strains BD-20, NP-M51, SKT-138, and SSKT-133. Bootstrap values of <75% are not shown. Scale bars: 0.02 substitutions per nucleotide.
