1. From the U.K. Health Security Agency (V.H., S.F., F.I., P.K., A. Saei, A.A., E.W., J.K., K.M., M. Cole, C.T., A.T.-K., N.H., D. Calbraith, N.S., I.M., Y.T., E. Linley, A.D.O., A. Semper, J.H., S.D., M. Chand, C.S.B., T.B., J.I., A.C., S.H.), Guy’s and St. Thomas’ NHS Foundation Trust (M. Chand), and the National Institute for Health Research (NIHR) Health Protection Research Unit in Vaccines and Immunisation, London School of Hygiene and Tropical Medicine, in partnership with Public Health England (A.C.)...