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Adverse events following first and second dose COVID-19 vaccination in England, October 2020 to September 2021: a national vaccine surveillance platform self-controlled case series study
- Ruby SM Tsang1 , Mark Joy1 , Rachel Byford1 , Chris Robertson2,3 , Sneha N Anand1 , William Hinton1 , Nikhil Mayor4 , Debasish Kar1 , John Williams1 , William Victor5 , Ashley Akbari6 , Declan T Bradley7,8 , Siobhan Murphy7 , Dermot O’Reilly7 , Rhiannon K Owen6 , Antony Chuter9 , Jillian Beggs9 , Gary Howsam5 , Aziz Sheikh1 , FD Richard Hobbs1 , Simon de Lusignan1,5
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View Affiliations Hide AffiliationsAffiliations: 1 Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom 2 Department of Mathematics and Statistics, University of Strathclyde, Glasgow, United Kingdom 3 Public Health Scotland, Glasgow, United Kingdom 4 Chelsea and Westminster Hospital NHS Foundation Trust, London, United Kingdom 5 Royal College of General Practitioners, London, United Kingdom 6 Population Data Science, Swansea University Medical School, Swansea University, United Kingdom 7 Centre for Public Health, Queen’s University Belfast, Belfast, United Kingdom 8 Public Health Agency, Belfast, United Kingdom 9 BREATHE – The Health Data Research Hub for Respiratory Health, Edinburgh, United Kingdom 10 Usher Institute, University of Edinburgh, Edinburgh, United KingdomSimon de Lusignansimon.delusignan phc.ox.ac.uk
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Citation style for this article: Tsang Ruby SM, Joy Mark, Byford Rachel, Robertson Chris, Anand Sneha N, Hinton William, Mayor Nikhil, Kar Debasish, Williams John, Victor William, Akbari Ashley, Bradley Declan T, Murphy Siobhan, O’Reilly Dermot, Owen Rhiannon K, Chuter Antony, Beggs Jillian, Howsam Gary, Sheikh Aziz, Hobbs FD Richard, de Lusignan Simon. Adverse events following first and second dose COVID-19 vaccination in England, October 2020 to September 2021: a national vaccine surveillance platform self-controlled case series study. Euro Surveill. 2023;28(3):pii=2200195. https://doi.org/10.2807/1560-7917.ES.2023.28.3.2200195 Received: 23 Feb 2022; Accepted: 01 Nov 2022
Abstract
Post-authorisation vaccine safety surveillance is well established for reporting common adverse events of interest (AEIs) following influenza vaccines, but not for COVID-19 vaccines.
To estimate the incidence of AEIs presenting to primary care following COVID-19 vaccination in England, and report safety profile differences between vaccine brands.
We used a self-controlled case series design to estimate relative incidence (RI) of AEIs reported to the national sentinel network, the Oxford-Royal College of General Practitioners Clinical Informatics Digital Hub. We compared AEIs (overall and by clinical category) 7 days pre- and post-vaccination to background levels between 1 October 2020 and 12 September 2021.
Within 7,952,861 records, 781,200 individuals (9.82%) presented to general practice with 1,482,273 AEIs, 4.85% within 7 days post-vaccination. Overall, medically attended AEIs decreased post-vaccination against background levels. There was a 3–7% decrease in incidence within 7 days after both doses of Comirnaty (RI: 0.93; 95% CI: 0.91–0.94 and RI: 0.96; 95% CI: 0.94–0.98, respectively) and Vaxzevria (RI: 0.97; 95% CI: 0.95–0.98). A 20% increase was observed after one dose of Spikevax (RI: 1.20; 95% CI: 1.00–1.44). Fewer AEIs were reported as age increased. Types of AEIs, e.g. increased neurological and psychiatric conditions, varied between brands following two doses of Comirnaty (RI: 1.41; 95% CI: 1.28–1.56) and Vaxzevria (RI: 1.07; 95% CI: 0.97–1.78).
COVID-19 vaccines are associated with a small decrease in medically attended AEI incidence. Sentinel networks could routinely report common AEI rates, contributing to reporting vaccine safety.
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