It said that data, collected from four Nordic countries, shows there is a suspicion of an increased risk of heart inflammation when vaccinated with Moderna shots, although the number of cases of heart inflammation remains very low.
The preliminary data from the Nordic study have been sent to the European Medicines Agency’s (EMA) adverse reaction committee and will now be assessed.
Sweden and Denmark said they now recommended the Comirnaty vaccine, from Pfizer/BioNTech, instead.
Norway already recommends the Cominarty vaccine to minors and said on Wednesday that it was reiterating this, underlining that the rare side effects may be more frequent for boys and young men, and mainly after receiving a second dose.
“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, said in a statement.
A Finnish health official said Finland expected to publish a decision on Thursday.
The EMA approved the use of Comirnaty in May, while Spikevax was given the nod for children over 12 years old in July.