The observed elevated mean concentration of plasma NGAL after asymptomatic infection (85.15 ng/mL), as well as during COVID-19 (78.94—104.54 ng/mL), is comparable to those observed in patients with chronic inflammation (98.19 ng/mL) when using the same material (plasma), method (ELISA), and supplier (R&D Diagnostics) [35]. The gene discussed is LCN2; the disease is infection.