Fig. S2.
The monthly average percent positive of four common human coronaviruses (CoVHKU1, CoVNL63, CoVOC43, and CoV229E) and the corresponding monthly total sunlight DNA-damage UV dose in four census regions of the U.S.
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.