Very high risk of myocarditis in Nordic young males after second COVID mRNA vaccine dose (Pfizer, Moderna etc.), 23 million residents Denmark, Finland, Norway, and Sweden; KARLSTAD et al.

by Paul Alexander

both 1st & 2nd doses of mRNA vaccines were associated with increased risk myocarditis & pericarditis. With 2 doses of same vaccine, risk of myocarditis was highest in males 16-24 years after 2nd dose



In a cohort study of 23.1 million residents across 4 Nordic countries, risk of myocarditis after the first and second doses of SARS-CoV-2 mRNA vaccines was highest in young males aged 16 to 24 years after the second dose. For young males receiving 2 doses of the same vaccine, data were compatible with between 4 and 7 excess events in 28 days per 100, 000 vaccinees after second-dose Pfizer, and between 9 and 28 per 100 000 vaccinees after second-dose Moderna.’

I wrote of this prior but wanted to remind you given I have gotten many more new subscribers.

‘The risk of myocarditis in this large cohort study was highest in young males after the second SARS-CoV-2 vaccine dose.’

Within the 28-day period, for males and females 12 years or older combined who received a homologous schedule, the second dose was associated with higher risk of myocarditis, with adjusted IRRs of 1.75 (95% CI, 1.43-2.14) for BNT162b2 (Pfizer) and 6.57 (95% CI, 4.64-9.28) for mRNA-1273 (Moderna). Among males 16 to 24 years of age, adjusted IRRs were 5.31 (95% CI, 3.68-7.68) for a second dose of Pfizer and 13.83 (95% CI, 8.08-23.68) for a second dose of Moderna, and numbers of excess events were 5.55 (95% CI, 3.70-7.39) events per 100 000 vaccinees after the second dose of Pfizer and 18.39 (9.05-27.72) events per 100 000 vaccinees after the second dose of Moderna. Estimates for pericarditis were similar.’