Early cross-coronavirus reactive signatures of protective humoral immunity against COVID-19
Kaplonek, P.; Wang, C.; Bartsch, Y.; Fischinger, S.; Gorman, M. J.; Bowman, K.; Kang, J.; Dayal, D.; Martin, P.; Nowak, R.; Hsieh, C.-L.; Feldman, J.; Juelg, B.; Nilles, E.; Musk, E. R.; Menon, A. S.; Fischer, E. S.; McLellan, J. S.; Schmidt, A.; Goldberg, M. B.; Filbin, M.; Hacohen, N.; Lauffenburger, D. A.; Alter, G.
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The introduction of vaccines has inspired new hope in the battle against SARS-CoV-2. However, the emergence of viral variants, in the absence of potent antivirals, has left the world struggling with the uncertain nature of this disease. Antibodies currently represent the strongest correlate of immunity against COVID-19, thus we profiled the earliest humoral signatures in a large cohort of severe and asymptomatic COVID-19 individuals. While a SARS-CoV-2-specific immune response evolved rapidly in survivors of COVID-19, non-survivors exhibited blunted and delayed humoral immune evolution, particularly with respect to S2-specific antibody evolution. Given the conservation of S2 across {beta}-coronaviruses, we found the early development of SARS-CoV-2-specific immunity occurred in tandem with pre-existing common {beta}-coronavirus OC43 humoral immunity in survivors, which was selectively also expanded in individuals that develop paucisymptomatic infection. These data point to the importance of cross-coronavirus immunity as a correlate of protection against COVID-19.
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