CALCA and infection: The indexes of patients with acute pancreatitis in the three groups were significantly higher than those in the healthy control group (all p < 0.05); The CD64 index, CD64 positive rate, and PCT in the infected group were significantly higher than those in the uninfected group (all p < 0.05), but there was no significant difference in CRP between the two groups (p > 0.05); All indexes in the sepsis group were significantly higher than those in infection group (all p < 0.05), as shown in Table 2.