Hall, V., Foulkes, S., Insalata, F., Kirwan, P., Saei, A., Atti, A., Wellington, E., Khawam, J., Munro, K., Cole, M., Tranquillini, C., Taylor-Kerr, A., Hettiarachchi, N., Calbraith, D., Sajedi, N., Milligan, I., Themistocleous, Y., Corrigan, D., Cromey, L., Price, L., Stewart, S., De Lacy, E., Norman, C., Linley, E., Otter, A., Semper, A., Hewson, J., D'Arcangelo, S., Chand, M., Brown, C., Brooks, T., Islam, J., Charlett, A., Hopkins, S. & SIREN Study Group 2022, 'Protection against SARS-CoV-2 after Covid-19 vaccination and previous infection', New England Journal of Medicine. https://doi.org/10.1056/NEJMoa2118691