Prevalence of antibody positivity to SARS-CoV-2 following the first peak of infection in England: serial cross-sectional studies of 365,000 adults by Ward, H, Cooke, GS, Atchison, C, Whitaker, M, Elliott, J, Moshe, M, Browne, JC, Flower, B, Daunt, A, Ainslie, K, Ashby, D, Donnelly, CA, Riley, S, Darzi, A, Barclay, W, Elliott, P

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