Your question isn't really well-posed. It's more about scientific communications than about government communications, and scientists are notoriously poor at co

Your question isn't really well-posed. It's more about scientific communications than about government communications, and scientists are notoriously poor at communicating nuanced technical information to the general public. And the general public is notoriously poor at appreciating nuance. Really, if this were intended for public consumption, they would avoid abbreviations like "AEs" and instead spell out "Adverse Events" or maybe be much more specific. I doubt most people even on here know what "pyrexia" is, I had to look it up to be sure. Anyway, more to your point, the data presented is collected from VAERS. I've spent some time reading these exact data lately to try to understand the risk/reward for vaccinating children. The system is intentionally, I think, focused on a free-text data input, along with a huge grab bag of drop-down-box symptoms. In any event, there's no obvious way to ensure people report other activities. If you read some of the VAERS reports you might appreciate my point better. They range from professional reports clearly written by a medical professional, to personal discussions, and in this age group have a lot of reports written by parents. In none of the hundreds I read did a person describe participation in heavy sports. By that omission we can conclude nothing whatsoever regarding the relationship between heavy sports and vaccination. The powerpoint from FDA that I read actually gave a lot of useful information. It was a much better summary of the VAERS data than I was able to glean by manually reading through the reports. Myocarditis <edit: no!> and syncope seemed to me to be the most frequent side effect of vaccination at least in this age group, and the powerpoint seems to align with my impression. EDIT: Syncope seemed to me to be the most frequent based on eyeballing the reports. I actually didn't notice myocarditis at all when I first looked through VAERS reports, not sure why I wrote that originally.