This is good data, and as the paper states, it is important that vaccine recipients are aware of possible side effects so that they know to seek medical attention if such arise. That said, it's important to note the scale of the effect observed. Looking at the cardiac arrest calls for instance, we're looking at an increase from roughly 7 to 10 per week, while hundreds of thousands of vaccine doses were being administered per week. Likewise ACS calls went from 30-35 per week up to a peak of around 45. These are obviously very significant increases, but still remained unlikely events. That said, unvaccinated case fatality rate from covid in that age range is also very low:<p>> Age-specific IFR estimates form a J shape, with the lowest IFR occurring at age 7 years (0·0023%, 95% uncertainty interval [UI] 0·0015–0·0039) and increasing exponentially through ages 30 years (0·0573%, 0·0418–0·0870), 60 years (1·0035%, 0·7002–1·5727), and 90 years (20·3292%, 14·6888–28·9754).
<a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(21)02867-1/fulltext" rel="nofollow">https://www.thelancet.com/journals/lancet/article/PIIS0140-6...</a><p>But of course we can't directly compare the two, as we'd need to know the fatality rate from these CA and ACS calls, not to mention looking at other negative outcomes short of death. Regardless, it certainly appears to me that vaccination still makes sense for all ages, but if you assume the risk of these side effects is the same for each booster, whereas the impacts on serious covid outcomes are diminishing, I guess there would be a point at which the risk of the side effects would outweigh the marginal benefit of additional / more frequent boosters for young people.