Based on the results shown in Figure 2E, the B16F10-OVA and CT26-OVA cancer cells were coinfected with IL-15 BV + IL-15Rα BV at the MOI of 8 and 16, respectively, and the levels of the IL-15:IL-15Rα complex secreted by each cell line at 0.3 or 3 × 105 cells were measured with an ELISA after 48 h of infection (Figure S3A). Here, IL15 is linked to infection.