
GRAd-COV2 is a gorilla adenovirus-based COVID-19 vaccine candidate encoding prefusion-stabilized spike. This study report that GRAd-COV2 is well tolerated and induces robust immune responses after a single immunization; a second administration increases binding and neutralizing antibody titers. Thus, GRAd vector is a valuable platform for genetic vaccine development, especially when robust CD8 response is needed.
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