Potent Anti‐SARS‐CoV‐2 Efficacy of COVID‐19 Hyperimmune Globulin from Vaccine‐Immunized Plasma

Abstract Coronavirus disease 2019 (COVID‐19) remains a global public health threat. Hence, more effective and specific antivirals are urgently needed. Here, COVID‐19 hyperimmune globulin (COVID‐HIG), a passive immunotherapy, is prepared from the plasma of healthy donors vaccinated with BBIBP‐CorV (Sinopharm COVID‐19 vaccine). COVID‐HIG shows high‐affinity binding to severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) spike (S) protein, the receptor‐binding domain (RBD), the N‐terminal domain of the S protein, and the nucleocapsid protein; and blocks RBD binding to human angiotensin‐converting enzyme 2 (hACE2). Pseudotyped and authentic virus‐based assays show that COVID‐HIG displays broad‐spectrum neutralization effects on a wide variety of SARS‐CoV‐2 variants, including D614G, Alpha (B.1.1.7), Beta (B.1.351), Gamma (P.1), Kappa (B.1.617.1), Delta (B.1.617.2), and Omicron (B.1.1.529) in vitro. However, a significant reduction in the neutralization titer is detected against Beta, Delta, and Omicron variants. Additionally, assessments of the prophylactic and treatment efficacy of COVID‐HIG in an Adv5‐hACE2‐transduced IFNAR^−/− mouse model of SARS‐CoV‐2 infection show significantly reduced weight loss, lung viral loads, and lung pathological injury. Moreover, COVID‐HIG exhibits neutralization potency similar to that of anti‐SARS‐CoV‐2 hyperimmune globulin from pooled convalescent plasma. Overall, the results demonstrate the potential of COVID‐HIG against SARS‐CoV‐2 infection and provide reference for subsequent clinical trials.