Antibody and T cell memory immune response after two doses of the BNT162b2 mRNA vaccine in older adults with and without prior SARS-CoV-2 infection
Demaret, J.; Corroyer-Simovic, B.; Alidjinou, E. K.; Goffard, A.; Trauet, J.; Miczek, S.; Vuotto, F.; Dendooven, A.; Huvent-Grelle, D.; Podvin, J.; Dreuil, D.; Faure, K.; Deplanque, D.; Bocket, L.; Duhamel, A.; Labreuche, J.; Sobaszek, A.; Puisieux, F.; Labalette, M.; Lefevre, G.
Show abstract
We quantified S1-specific IgG, neutralizing antibody titers, specific IFN{gamma} secreting T cells and functionality of specific CD4+ and CD8+ T cells in 130 young adults (median age 44.0 years) and 106 older residents living in a long-term care facility (86.5 years) after 2 doses of BNT162b2. Three months after the first injection, humoral and cellular memory responses were dramatically impaired in the 54 COVID-19-naive older compared to the 121 COVID-19-naive younger adults. Notably, older participants neutralizing antibodies, detected in 76.5% (versus 100% in young adults, P < 0.0001), were ten times lower than the youngers antibody titers (P < 0.0001). Antibody and T cell responses were greater among the 52 COVID-19-recovered than among the 54 COVID-19-naive older adults (P < 0.0001). Our study shows that 2 doses of BNT162b2 does not guarantee long-term protection against SARS-CoV-2 in the older. An additional dose should be considered to boost their specific memory response.
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