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. 2022 Jul 1;12(7):e060425. doi: 10.1136/bmjopen-2021-060425

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Tree diagram detailing the characteristics of spontaneous reports of myocarditis and pericarditis on the Yellow Card database following COVID-19 messenger RNA (mRNA) vaccines in immunocompromised individuals (Yellow Card, UK). Reports of myocarditis, pericarditis or myopericarditis from immunocompromised individuals were searched in the Yellow Card scheme following COVID-19 mRNA vaccines, either Moderna or Pfizer BioNTech. Data provided by Medicines and Healthcare products Regulatory Agency, datalock 1 December 2021. *n=3 unspecified, †n=2 under 18 years. For age category n=5 unknown.