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.
The percentage of cases reported in which sequence information of the virus is acquired by country. Only the 20 countries with the highest frequencies are shown (data source: Johns Hopkins University and Medicine Coronavirus Resource Center [30].
