Fig. 1.
Detection frequencies of respiratory viruses in Beijing and Shanghai according to matched age groups. We considered P < 0.05 to be significant (marked as an asterisk) for all analyses between two cities
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.