Elevated exhaustion levels and reduced functional diversity of T cells in peripheral blood may predict severe progression in COVID-19 patients - Zheng, Hong-Yi; Zhang, Mi; Yang, Cui-Xian; Zhang, Nian; Wang, Xi-Cheng; Yang, Xin-Ping; Dong, Xing-Qi; Zheng, Yong-Tang (Cellular & molecular immunology, 2020)