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 epidemic will have different trends under different single strategies. (a–c) show the trend under lockdown, while (d)–(f) show the trend for an open community strategy. In particular, (a) and (d) show the changes of population which are affected by COVID, that is, Ailing (A), Diagnosed (D), and Extinct (E); (b) and (e) show the changes of Susceptible (S) and Isolated (I); (c) and (f) show the change in cost under different single strategies.
