Author contributions
E.F.
RECRUITMENT
J.C., M.L., J.C.V., F.M.O., J.M.R., J.F., K.A.P., and L.M.C. conceptualized and designed the study. K.A.P., L.M.C., and J.C. wrote and edited the manuscript. M.L., F.M.O., and J.M.R. were responsible for project administration. J.C., K.A.P., L.M.C., M.L., and J.F., accessed, verified, and analyzed the data, and generated the interim report. E.F. is the study site scientific director and supervised the study. G.A.Y. is a study site principal investigator. K.H., G.A.Y., and P.E.P.L. were responsible for the site work including the recruitment, follow up, and data collection. B.M., M.S., A.D., C.P.C., L.S., L.B. performed immunogenicity experiments. A.C., A.V., D.A., and J.G. contributed to the performance and analysis of neutralizing antibody assays. S.G., and VVGM provided the plasma samples from individuals boosted with authorized vaccines. J.M.R., J.C.V., F.M.O. and L.P.C. R&D and C.M.C. consortium were responsible for R&D for chemistry, manufacture and controls of antigen and study products. J.C.V. and F.M.O. provided regulatory oversight. ML was responsible for the overall supervision of the study and monitored the trial. All authors contributed to data interpretation, review, and editing of this manuscript. All authors have read and approved the final version of the manuscript.