IFNA2 and HIV infectious disease: To better understand the physiological parameters responsible for such maintenance of weight after IFN-α blockade, we also assessed post-ATI alterations in the clinical variables of the VACS index, an index of multiorgan clinical variables, including measures of erythroid, renal, liver, and metabolic function (Supplemental Table 1 and Supplemental Table 7: List of VACS variables), which predict mortality in HIV infection (64).