Heart inflammation rates higher after Moderna vaccine - Canada data

Reported cases of rare heart inflammation were relatively higher after Moderna's COVID-19 vaccine compared with the Pfizer/BioNTech shots. The majority of the affected individuals recovered quickly.

Vials with Pfizer-BioNTech and Moderna coronavirus disease (COVID-19) vaccine labels are seen in this illustration picture taken March 19, 2021.  (photo credit: REUTERS/DADO RUVIC/ILLUSTRATION/FILE PHOTO)
Vials with Pfizer-BioNTech and Moderna coronavirus disease (COVID-19) vaccine labels are seen in this illustration picture taken March 19, 2021.
(photo credit: REUTERS/DADO RUVIC/ILLUSTRATION/FILE PHOTO)

Canadian health officials said on Friday data suggests reported cases of rare heart inflammation were relatively higher after Moderna's COVID-19 vaccine compared with the Pfizer/BioNTech shots.

The data also indicated heart inflammation occurs more often in adolescents and adults under 30 years of age, and more often in males.

The statement from the Public Health Agency of Canada said the majority of the affected individuals experienced relatively mild illness and recovered quickly.

Vials with a sticker reading, ''COVID-19 / Coronavirus vaccine / Injection only'' and a medical syringe are seen in front of a displayed Moderna logo in this illustration taken October 31, 2020. (credit: REUTERS/DADO RUVIC/ILLUSTRATION)Vials with a sticker reading, ''COVID-19 / Coronavirus vaccine / Injection only'' and a medical syringe are seen in front of a displayed Moderna logo in this illustration taken October 31, 2020. (credit: REUTERS/DADO RUVIC/ILLUSTRATION)

The risk of cardiac complications, including heart inflammation, has been shown to be substantially increased following COVID-19 infections, with the risks higher after the infection than after vaccination, according to the statement.

The benefits of mRNA shots in preventing COVID-19 continue to outweigh the risks, regulators in the United States, EU and the World Health Organization have said.