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. 2021 Dec;2(12):e811–e819. doi: 10.1016/S2666-7568(21)00253-1

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© 2021 Published by Elsevier Ltd. This is an Open Access article under the CC BY-NC-ND 4.0 license

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Antibody longevity between T1 and T2 timepoints

(A) Seropositive staff and residents by binding assays. (B) Seropositive staff and residents with detectable neutralising antibody titres to live virus (England.2). Timepoint T1 was May, June,or July, 2020, 4 weeks after the first set of testing. Timepoint T2 was September or October, 2020, 4 months after baseline T1 serology. *201 staff and 147 residents, p>0·9999. † 193 staff and 142 residents, p=0·84. ‡180 staff and 136 residents, p=0·026; Fisher's exact p<0·05. §46 staff, loss between T1 and T2 p=0·0063; Fisher's exact p<0·005. ¶86 residents, loss between T1 and T2 p<0·0001; Fisher's exact p<0·0001.