UK Regulator Detected Safety Signal for Post-Vaccination Myocarditis in Early 2021: Emails

The UK Medicines and Healthcare products Regulatory Agency did not alert the public for months afterward.

Dr. June Raine, chief executive of the Medicines and Healthcare products Regulatory Agency, during a media briefing in Downing Street, London, on Sept. 13, 2021. Hannah McKay/PA

The United Kingdom’s drug regulator detected a safety signal for heart inflammation after COVID-19 vaccination in early 2021, according to newly reviewed emails.

The UK Medicines and Healthcare Products Regulatory Agency (MHRA), the regulator, detected the signal by March 1, 2021, the emails show. The regulator did not warn the public about the issue for nearly four months.