Figure 3.
County-level estimates of the percentage of the population effectively protected against infection at 4 time points between 1 January and 1 December 2021. Counties excluded owing to missing or insufficient data are colored yellow.
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.