The emergence of SARS-CoV-2 variants raised questions regarding the durability of immune responses after homologous or heterologous boosters after Ad26.COV2.S-priming. We found that SARS-CoV-2-specific binding antibodies, neutralizing antibodies, and T cells are detectable 5 months after boosting, although waning of antibodies and limited cross-reactivity with Omicron BA.1 was observed.
Keywords: Ad26.COV2.S; SARS-CoV-2; waning immunity.
© The Author(s) 2022. Published by Oxford University Press on behalf of Infectious Diseases Society of America.