IFNG and HIV infectious disease: In the study by McCain et al. [30] on 62 patients undergoing treatment for HIV infection, IFN-γ levels were significantly increased from 181.34 (SE 10.24) pg/mL to 212.81 (SE 12.03) pg/mL after 10 weeks of tai chi training but significantly decreased from 599.51 (SE 38.66) pg/mL to 366.94 (SE 23.31) pg/mL in the control group, showing a marked difference.