On Wednesday, Sweden and Denmark announced that they would stop using Moderna’s Covid-19 vaccine for younger age groups after numerous reports of rare side effects such as myocarditis.

The Swedish Health Agency has stopped using the vaccine for anyone born in 1991 or later after receiving data that shows an increased risk of myocarditis and pericarditis in youth and young adults who have received the vaccine. Both conditions cause an inflammation of the lining around the heart.


“The connection is especially clear when it comes to Moderna’s vaccine Spikevax, especially after the second dose,” – Swedish Health Agency.

Denmark has mainly been using the Pfizer/Biontech vaccine for people between the ages of 12-17. However, it will stop using the Moderna vaccine for anyone under the age of 18 as a “precautionary principle.”


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“In the preliminary data … there is a suspicion of an increased risk of heart inflammation, when vaccinated with Moderna,” – Danish Health Authority. 

The information came from an unpublished Nordic study which is now being sent to the European Medicines Agency (EMA) for further evaluation. Norway currently recommends the Cominarty vaccine for minors. The side effects from Moderna’s Covid-19 vaccine appear to happen in boys and young men after they receive the second shot.

“Men under the age of 30 should also consider choosing Cominarty when they get vaccinated,” – Geir Bukholm, head of infection control at the Norwegian Institute of Publica Health.