The time frame of significantly elevated serum cytokines at their peak levels, highest fever-, and clearance of H7N9 virus, as days (median and range) when IFN-γ, TNF-α, IL-6, IL-10, and IP-10 are at peak levels and days (median and range) when patients had the highest fever during hospitalization.

<p>Viral clearance is the time point when H7N9 viral RNA became undetectable.