Canada to recommend that young people - in this case boys and men aged 12 through 29 - should opt for the Pfizer Covid-19 booster shot over Moderna's Spikevax due to a higher risk of myocarditis.
From Dec 3.
Quote:
Lower reported rates of
myocarditis/pericarditis following
vaccination with Pfizer-BioNTech
Comirnaty (30 mcg) compared to
Moderna Spikevax (100 mcg). [This is
based upon data following the second
dose in the primary series using
Moderna Spikevax (100 mcg).
Evidence following the Moderna
Spikevax (50 mcg) booster dose is
limited.]
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https://www.canada.ca/content/dam/ph...cine-doses.pdf
Also says that booster could be offered if there was a shorter interval between the first two shots. Yet other countries are again tripping over themselves to lower the interval for the booster shot.