RT Journal Article SR Electronic T1 Trends and clinical characteristics of COVID-19 vaccine recipients: a federated analysis of 57.9 million patients' primary care records in situ using OpenSAFELY JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP e51 OP e62 DO 10.3399/BJGP.2021.0376 VO 72 IS 714 A1 Helen J Curtis A1 Peter Inglesby A1 Caroline E Morton A1 Brian MacKenna A1 Amelia Green A1 William Hulme A1 Alex J Walker A1 Jessica Morley A1 Amir Mehrkar A1 Seb Bacon A1 George Hickman A1 Chris Bates A1 Richard Croker A1 David Evans A1 Tom Ward A1 Jonathan Cockburn A1 Simon Davy A1 Krishnan Bhaskaran A1 Anna Schultze A1 Christopher T Rentsch A1 Elizabeth J Williamson A1 Anna Rowan A1 Louis Fisher A1 Helen I McDonald A1 Laurie Tomlinson A1 Rohini Mathur A1 Henry Drysdale A1 Rosalind M Eggo A1 Kevin Wing A1 Angel YS Wong A1 Harriet Forbes A1 John Parry A1 Frank Hester A1 Sam Harper A1 Shaun O’Hanlon A1 Alex Eavis A1 Richard Jarvis A1 Dima Avramov A1 Paul Griffiths A1 Aaron Fowles A1 Nasreen Parkes A1 Ian J Douglas A1 Stephen JW Evans A1 Liam Smeeth A1 Ben Goldacre A1 (The OpenSAFELY Collaborative) YR 2022 UL http://bjgp.org/content/72/714/e51.abstract AB Background On 8 December 2020 NHS England administered the first COVID-19 vaccination.Aim To describe trends and variation in vaccine coverage in different clinical and demographic groups in the first 100 days of the vaccine rollout.Design and setting With the approval of NHS England, a cohort study was conducted of 57.9 million patient records in general practice in England, in situ and within the infrastructure of the electronic health record software vendors EMIS and TPP using OpenSAFELY.Method Vaccine coverage across various subgroups of Joint Committee on Vaccination and Immunisation (JCVI) priority cohorts is described.Results A total of 20 852 692 patients (36.0%) received a vaccine between 8 December 2020 and 17 March 2021. Of patients aged ≥80 years not in a care home (JCVI group 2) 94.7% received a vaccine, but with substantial variation by ethnicity (White 96.2%, Black 68.3%) and deprivation (least deprived 96.6%, most deprived 90.7%). Patients with pre-existing medical conditions were more likely to be vaccinated with two exceptions: severe mental illness (89.5%) and learning disability (91.4%). There were 275 205 vaccine recipients who were identified as care home residents (JCVI group 1; 91.2% coverage). By 17 March, 1 257 914 (6.0%) recipients had a second dose.Conclusion The NHS rapidly delivered mass vaccination. In this study a data-monitoring framework was deployed using publicly auditable methods and a secure in situ processing model, using linked but pseudonymised patient-level NHS data for 57.9 million patients. Targeted activity may be needed to address lower vaccination coverage observed among certain key groups.