CD274 and viral infectious disease: In this regard, serum levels of the molecules programmed cell death ligand 1 (PD‐L1), mucin domain‐containing molecule‐3 (TIM‐3), and its ligand Galectin‐9 (GAL‐9) have been evaluated in the context of diverse viral infections, mainly in those where there is an excessive inflammatory response, including SARS‐CoV‐2 infection.6, 7, 8, 9