Hall VJ, Foulkes S, Charlett A, Atti A, et al. SARS-CoV-2 infection rates of antibody-positive compared with antibody-negative health-care workers in England: a large, multicentre, prospective cohort study (SIREN). Lancet 2021 Apr 9. pii: S0140-6736(21)00675.
PMID: 33844963