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.
Number of new cases of COVID-19 versus AH across 10-day intervals between Jan 1 and Apr 9, 2020 in the US. The vulnerable AH ranges are in red color. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
