The analysis of liver’s function of protein synthesis—based on the mean serum albumin values—exhibited the lowest albumin levels in HBV/HDV co-infection (4.27 g/dL), and the highest in the HCV single infection (4.86 g/dL), with a highly significant difference between them (p-value = 0.0474) (Table 2b). This evidence concerns the gene ALB and infection.