Since the group with extrapulmonary TB had reduced levels of IFN-γ compared to the TB group and the majority were aged between 18 and 39 years, an assessment of IFN-γ levels was performed with only patients with pulmonary TB among the different age groups, which revealed a significant difference (p < 0.05) between the 18–38 age group (median = 10.14; IIQ = 1.72) and the >59 years group (median = 8.38; IIQ = 1.65). Here, IFNG is linked to pulmonary tuberculosis.