The Swedish health service announced on Wednesday that the use of Moderna's COVID-19 vaccine for those born in 1991 and later will be halted due to reports of uncommon side effects such as myocarditis.

Moderna Logo 1200x800 - JDRF

According to the health agency, data showed an increase in myocarditis and pericarditis among vaccinated children and young adults.

"The link is especially clear when it comes to Moderna's vaccine Spikevax, especially after the second dose," the company said in a statement, adding that the risk of being affected was "extremely low."

Instead, the health service now recommends the Pfizer/BioNTech Comirnaty vaccination. It also said that those born in 1991 or after who had had a first Moderna shot (about 81,000 persons) would not receive a second Moderna vaccine.

The Swedish health authorities said earlier this week that only the Pfizer/BioNTech vaccination would be given to children aged 12 to 15.

Comirnaty was authorized by the European Medicines Agency in May, and Spikevax was approved for children over the age of 12 in July.