KEGG pathway analysis indicated that immunological signalling pathways (including the IL‐17 signalling pathway, T cell receptor signalling pathway and Th17 cell differentiation), TNF signalling pathway, p53 signalling pathway, lipid atherosclerosis, hepatitis B and hepatitis C were enriched, as shown in Figure 4B (corrected p < 0.05). Here, IL17A is linked to hepatitis C virus infection.