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.
Actual and simulated confirmed positives in 3 regions (upper) and estimated transmission efficiencies (expressed as relative to efficiency derived from natural reproduction rate, lower) are shown. The periods with maximum transmission efficiency in each region were considered as the baseline of outbreak.
