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.
Percentage of seroprevalence is shown for each category. ****p<0.0001, ***p <0.001, **p <0.01, *p <0.05 and NS denotes not statistically significant (Fisher Exact Test).
