Effect of Different Adjuvants on Immune Responses Elicited by Protein-Based Subunit Vaccines against SARS-CoV-2 and Its Delta Variant oleh Naru Zhang, Qianting Ji, Zezhong Liu, Kaiming Tang, Yubin Xie, Kangchen Li, Jie Zhou, Sisi Li, Haotian Shang, Zecan Shi, Tianyu Zheng, Jiawei Yao, Lu Lu, Shuofeng Yuan, Shibo Jiang