As shown in Table 3, the increase in the activity of glutathione reductase enzyme in the lysate at 30, 60 and 90 min post infection with S. aureus from Riboflavin pre-treated macrophages were found significant (p < 0.05) when compared to the activity of glutathione reductase enzyme after time-dependent phagocytosis by macrophages treated without Riboflavin. This evidence concerns the gene GSR and infection.