Imperial College London
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DrChristinaAtchison

Faculty of Medicine, School of Public Health

Principal Clinical Academic Fellow
 
 
 
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Contact

 

christina.atchison11

 
 
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Location

 

Reynolds BuildingCharing Cross Campus

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Summary

 

Publications

Citation

BibTex format

@unpublished{Ward:2020:10.1101/2020.10.26.20219725,
author = {Ward, H and Cooke, G and Atchison, C and Whitaker, M and Elliott, J and Moshe, M and Brown, JC and Flower, B and Daunt, A and Ainslie, K and Ashby, D and Donnelly, C and Riley, S and Darzi, A and Barclay, W and Elliott, P},
doi = {10.1101/2020.10.26.20219725},
title = {Declining prevalence of antibody positivity to SARS-CoV-2: a community study of 365,000 adults},
url = {http://dx.doi.org/10.1101/2020.10.26.20219725},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - UNPB
AB  - Background The prevalence and persistence of antibodies following a peak SARS-CoV-2 infection provides insights into its spread in the community, the likelihood of reinfection and potential for some level of population immunity.Methods Prevalence of antibody positivity in England, UK (REACT2) with three cross-sectional surveys between late June and September 2020. 365104 adults used a self-administered lateral flow immunoassay (LFIA) test for IgG. A laboratory comparison of LFIA results to neutralization activity in panel of sera was performed.Results There were 17,576 positive tests over the three rounds. Antibody prevalence, adjusted for test characteristics and weighted to the adult population of England, declined from 6.0% [5.8, 6.1], to 4.8% [4.7, 5.0] and 4.4% [4.3, 4.5], a fall of 26.5% [-29.0, −23.8] over the three months of the study. There was a decline between rounds 1 and 3 in all age groups, with the highest prevalence of a positive result and smallest overall decline in positivity in the youngest age group (18-24 years: −14.9% [-21.6, −8.1]), and lowest prevalence and largest decline in the oldest group (75+ years: −39.0% [-50.8, −27.2]); there was no change in antibody positivity between rounds 1 and 3 in healthcare workers (+3.45% [-5.7, +12.7]).The decline from rounds 1 to 3 was largest in those who did not report a history of COVID-19, (−64.0% [-75.6, −52.3]), compared to −22.3% ([-27.0, −17.7]) in those with SARS-CoV-2 infection confirmed on PCR.Discussion These findings provide evidence of variable waning in antibody positivity over time such that, at the start of the second wave of infection in England, only 4.4% of adults had detectable IgG antibodies using an LFIA. Antibody positivity was greater in those who reported a positive PCR and lower in older people and those with asymptomatic infection. These data suggest the possibility of decreasing population immunity and increasing risk of rei
AU  - Ward,H
AU  - Cooke,G
AU  - Atchison,C
AU  - Whitaker,M
AU  - Elliott,J
AU  - Moshe,M
AU  - Brown,JC
AU  - Flower,B
AU  - Daunt,A
AU  - Ainslie,K
AU  - Ashby,D
AU  - Donnelly,C
AU  - Riley,S
AU  - Darzi,A
AU  - Barclay,W
AU  - Elliott,P
DO  - 10.1101/2020.10.26.20219725
PY  - 2020///
TI  - Declining prevalence of antibody positivity to SARS-CoV-2: a community study of 365,000 adults
UR  - http://dx.doi.org/10.1101/2020.10.26.20219725
UR  - http://medrxiv.org/content/early/2020/10/27/2020.10.26.20219725.abstract
UR  - http://hdl.handle.net/10044/1/83634
ER  -
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