Patients with infectious complications after ERCP had significantly higher median CRP levels (1 mg/dL vs. 6.55 mg/dL, p < 0.001) and median leukocyte counts (4.95 Tsd/μL vs. 6.27 Tsd/μL, p < 0.001) after ERCP compared to patients without infections, and they were hospitalized significantly longer (4 days vs. 5 days, p = 0.003) (Table 4). This evidence concerns the gene CRP and infection.