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.
Kaplan-Meier curves estimating the cumulative probability of viral clearance in total population (a) and after stratifying by the severity of respiratory disease [PaO2/FiO2 ratio ≤300 mmHg versus >300 mmHg (b) andPaO2/FiO2 ratio ≤200 mmHg versus >200 mmHg (c)].
