Initial blood tests showed elevated levels of CRP (15.3 mg/dl; IQR 8.8–21.3), PCT (0.36 ng/ml; IQR 0.13–0.89), and D-dimer (2.7 μg/ml; IQR 1.3–7.1) in the Omicron group, which are affected by complications of bacterial infection. Here, CRP is linked to bacterial infectious disease.