ArticlebioRxiv : the preprint server for biology2026
Early innate immune signatures correlate with Ad26.COV2.S vaccine durability and protective efficacy.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
The innate immune system is rapidly activated following antigen exposure and plays a critical role in shaping the ensuing adaptive immune responses. In this study, we performed bulk RNA sequencing and proteomic profiling in a cohort of 25 rhesus macaques following Ad26.COV2.S immunization to characterize early innate correlates of vaccine immunogenicity and protection. Our results show that innate immune activation occurred as early as day 1 post-vaccination and demonstrated an systemic enrichment of antiviral interferon pathways, interleukin signaling, and innate immune cell signatures. These early transcriptomic signatures correlated positively with humoral and cellular immune responses at 6 weeks following vaccination and correlated inversely with viral loads following SARS-CoV-2 challenge. Similar correlates of immunogenicity were observed in a cohort of 25 adult healthy participants vaccinated with Ad26.COV2.S. Taken together, these findings highlight the importance of early activation of the innate immune system for Ad26.COV2.S vaccine immunogenicity and protective efficacy.
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