Real-world data shows increased reactogenicity in adults after heterologous compared to homologous prime-boost COVID-19 vaccination, March−June 2021, England

Author:

Powell Annabel A1,Power Linda1,Westrop Samantha1,McOwat Kelsey1,Campbell Helen1,Simmons Ruth1,Ramsay Mary E21,Brown Kevin1,Ladhani Shamez N31,Amirthalingam Gayatri1

Affiliation:

1. Immunisation and Countermeasures Division, Public Health England, London, United Kingdom

2. London School of Hygiene and Tropical Medicine, London, United Kingdom

3. Paediatric Infectious Diseases Research Group, St. George’s University of London, London, United Kingdom

Abstract

Adults receiving heterologous COVID-19 immunisation with mRNA (Comirnaty) or adenoviral-vector (Vaxzevria) vaccines had higher reactogenicity rates and sought medical attention more often after two doses than homologous schedules. Reactogenicity was higher among ≤ 50 than > 50 year-olds, women and those with prior symptomatic/confirmed COVID-19. Adults receiving heterologous schedules on clinical advice after severe first-dose reactions had lower reactogenicity after dose 2 following Vaxzevria/Comirnaty (93.4%; 95% confidence interval: 90.5–98.1 vs 48% (41.0–57.7) but not Comirnaty/Vaxzevria (91.7%; (77.5–98.2 vs 75.0% (57.8–87.9).

Publisher

European Centre for Disease Control and Prevention (ECDC)

Subject

Virology,Public Health, Environmental and Occupational Health,Epidemiology

Reference16 articles.

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