This document summarizes a study that investigated levels of the cytokine IL-17A in Type 1 diabetes mellitus (T1DM) patients compared to healthy controls. Sixty T1DM patients and sixty healthy controls matched for age and sex were included. The mean age of patients was 16.32 years and most patients were between 10-19 years old. IL-17A levels were significantly higher in the sera of diabetic patients (1312.06 pg/ml) than in healthy controls (332.28 pg/ml). The study concludes that IL-17A may play an important role in the susceptibility or protection against the development of T1DM.