Onset and window of SARS-CoV-2 infectiousness and temporal correlation with symptom onset: a prospective, longitudinal, community cohort study by Hakki, S, Zhou, J, Jonnerby, J, Singanayagam, A, Barnett, JL, Madon, KJ, Koycheva, A, Kelly, C, Houston, H, Nevin, S, Fenn, J, Kundu, R, Crone, MA, Ahmad, S, Derqui-Fernandez, N, Conibear, E, Freemont, PS, Taylor, GP, Ferguson, N, Zambon, M, Barclay, WS, Dunning, J, Lalvani, A, Badhan, A, Varro, R, Luca, C, Quinn, V, Cutajar, J, Nichols, N, Russell, J, Grey, H, Ketkar, A, Miserocchi, G, Tejpal, C, Catchpole, H, Nixon, K, Di Biase, B, Hopewell, T, Narean, JS, Samuel, J, Timcang, K, McDermott, E, Bremang, S, Hammett, S, Evetts, S, Kondratiuk, A