Copenhagen, Denmark – Finland has joined other Nordic countries in suspending or discouraging the use of Moderna’s COVID-19 vaccine in certain age groups because of an increased risk of heart inflammation, a rare side effect associated with the shot. .

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The Finnish Institute for Health and Welfare said on Thursday that officials would not give the pill to men under the age of 30. Instead they will be offered the Pfizer/BioNTech vaccine. The government agency said it found that young men and boys had a slightly higher risk of developing myocarditis.

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Finland’s move followed similar decisions by three neighboring countries on Wednesday. Sweden suspended the use of Moderna for people under the age of 30, Denmark said the Swiss-made vaccine would not be offered to people under the age of 18, and Norway said the vaccine would not be offered to people under 30. instead of getting the Pfizer vaccine.

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All four countries based their decision on an unpublished study with Sweden’s Public Health Agency saying it indicated an “increased risk of side effects such as inflammation of the heart muscle or the pericardium” – the double-walled sac containing the heart and roots. of the main ships. It added: “The risk of being affected is very low.”

Preliminary information from the Nordic study has been sent to the Adverse Reactions Committee of the European Medicines Agency for evaluation.