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.
Changes of lung involvement extent on CT according to the time from symptom onset; 1~7 days showed the early rapid progressive stage with involving extent fast progressing, 8~14 days is the advanced stage with the involving extent maintaining a peak plateau level, and after 14 days, the involving extent started to decrease
