More recently, hasn't pediatric COVID been much more of a thing?Obviously H1 and H2 are not mutually exclusive. I suppose it's possible that there's some small "safety first" bias in these results, but it's extremely hard to believe that that's really what's driving that outcome. It's way more likely that reason why they found so little covid in their pediatric sample is because pediatric covid has been a relatively uncommon thing all this time, which we've known for quite a while.
One other possible "safety first" factor that could confound your H1 and H2... In the children trials, the type of parents who signed their children up far more likely to be vaccinated themselves, such that both the test group and control group were surrounded by vaxxed people who are less likely to spread COVID (i.e. both groups were less likely to be exposed than the adult trials). In the adult trials, neither group was surrounded by vaxxed people (i.e. both groups were more likely to be exposed than the child trials).
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