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.
(a) No. of cases at 1st epidemic wave (January 16 to May 24). (b) No. of cases at 2nd epidemic wave (May 25 to August 30). Time of arrival of the virus in each prefecture is shown in S2 Table.
