Fig. 1: Survival of the three cohorts as of June 2nd.

Survival of patients after acute COVID-19 diagnosed in March (
), April (
) or May 2020 (
), respectively. Survival duration was calculated from the date of SARS-CoV-2-positive swab. The difference of survival probability between patients diagnosed in March versus April 2020 is significant (log-rank test: P = 0.03).