Using fixed multivariable analysis reported in Supplementary Figure 3 (available online), increased post–COVID-19 CRP (HR = 3.18, 95% CI = 1.61 to 9.01), LDH (HR = 5.94, 95% CI = 2.19 to 16.07), NLR (HR = 3.29, 95% CI = 1.95 to 5.54), and a decreased OIS (HR = 3.27, 95% CI = 1.71 to 6.23) were statistically significantly associated with an increased risk of death, whereas no association was confirmed for post–COVID-19 PLR. This evidence concerns the gene CRP and COVID-19.