Significant differences were registered between the form of COVID-19 depending on the vaccination status (p = 0.007), between LDH concentrations depending on the virus variant (p = 0.026), and in IL-6 (p = 0.039), CRP (p < 0.001), ferritin concentrations (p = 0.007), and vaccination status (p = 0.012) depending on the gender. Here, CRP is linked to COVID-19.