IL19 and COVID-19: Moreover, IL-19 gene expression level in vivo, was significantly higher in the blood of COVID-19 patients compared to patients with SARS-CoV-1, IAV, or RSV infection (Fig. 5B, log-fold of 0.99 ± 0.3 compared to SARS-CoV-1; P = 0.002, and log-fold of 1.7 ± 0.2 compared to IAV or RSV; P < 0.0001).