Fig. 1.
Results obtained by considering only the addresses on the map as data sets. No weight is assigned to each address on the basis of the number of recorded cases.
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.