Russell, C., Fairfield, C., Drake, T., Turtle, L., Seaton, R., Wootton, D., Sigfrid, L., Harrison, E., Docherty, A., de Silva, T., Egan, C., Pius, R., Hardwick, H., Merson, L., Girvan, M., Dunning, J., Nguyen-Van-Tam, J., Openshaw, P., Baillie, J., Semple, M., Ho, A. & ISARIC4C Investigators 2021, 'Co-infections, secondary infections, and antimicrobial use in patients hospitalised with COVID-19 during the first pandemic wave from the ISARIC WHO CCP-UK study: a multicentre, prospective cohort study', Lancet Microbe. http://dx.doi.org/10.1016/S2666-5247(21)00090-2