1. From the United Kingdom Health Security Agency (N.A., E.T., J.S., C.G., F.K., R.S., E.G., S.T., N.G., G.D., R.M., C.N.J.C., G.A., M.E., M.Z., K.B., S.H., M.C., S.N.L., M.R., J.L.B.), the National Institute of Health Research (NIHR) Health Protection Research Unit in Vaccines and Immunisation, London School of Hygiene and Tropical Medicine (N.A., C.N.J.C., G.A., K.B., M.R., J.L.B.), the NIHR Health Protection Research Unit in Respiratory Infections, Imperial College London (M.Z., J.L.B.), Guy’s and St....