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) Number of reported SARS-CoV-2 infections in Shanghai between 2020–2022, stratified by local and imported infections. (b) The same as in (a), but for the period from January 1 to May 31, 2022.
